On January 31, 2020 President Donald Trump surprisingly announced a ban on the issuance of all US visas leading to Nigerian citizens’ permanent residence in the USA. Footnote 1 We analyze the effect of Trump’s announcement on a sample of Nigerian expatriates in Ghana.
Our study contributes to a line of research that has documented a number of instances where US foreign policy has generated anti-American sentiment – especially in cases where US policies are seen as infringing on national sovereignty of the targeted countries. Clear examples include US military interventions such as those in Iraq or Syria, which are associated with an increase in antipathy toward the USA and its citizens across many of the countries of Middle East (Chiozza Reference Chiozza, Katzenstein and Keohane2006; Jamal et al. Reference Jamal, Keohane, David and Dustin2015). Other foreign policy cases include those where the US deploys its power to remake economic (Sokolov et al. Reference Sokolov, Inglehart, Ponarin, Vartanova and William2018) or gender relations (Bush and Jamal Reference Bush and Jamal2015).
We argue that restrictive immigration policies that target specific countries or groups such as the immigration ban enacted by the Trump administration can similarly increase anti-American sentiment. Indeed, the fact that the ban singled out specific countries plays a central role in our argument. Since all countries control borders and restrict migration, most people would not notice or react to normal changes in immigration policy. However, policies, like those announced by the Trump administration, that single out specific countries (or ethnic groups) create what FitzGerald and Cook-Martín (Reference FitzGerald and David2015, 27) call the “politics of international humiliation.” The US did not exclude Nigerians because they lack requisite skills, education, or family ties. Instead, the US categorically excluded them as Nigerians. Footnote 2
While common throughout the first half of the 20th century, immigration policies discriminating by national origin or ethnicity are now widely viewed as violating liberal principles and outside the legitimate realm of immigration policy (Joppke Reference Joppke2005). So, rather than an instance of normal immigration policy, which would concern only those directly affected (in our case, those planning to move to the US), discriminatory immigration bans are an assault to the banned country’s national honor and international reputation. Since nations are status groups that offer their members national prestige as a symbolic resource (Finlayson Reference Finlayson1998), citizens may interpret the devaluation of that group identity as a threat to their self-worth. A long line of lab-based social-psychology research demonstrates that individuals show more in-group bias and negative attitudes towards out groups in response to collective social identity devaluation (for a review see Ellemers, Spears, and Doosje Reference Ellemers, Spears and Doosje2002). People may also try to repair the tarnished group identity and embark on strategies to differentiate their group. Strategies may include derogating out-group members – especially when individuals are highly committed to a threatened identity that they believe is of high status (Branscombe and Wann Reference Branscombe and Wann1994). When it comes to national identity, perceived threats to the national group’s position can also increase hubris – the belief that one’s own country is better than others (Feinstein Reference Feinstein2016). Similarly, research in the US shows that maintaining the honor of the national community and a reputation for resolve is a main driver of public opinion on administrations’ reactions to international security incidents (Snyder and Borghard Reference Snyder and Borghard2011). We argue that discriminatory immigration bans that single out specific countries as undesirable will set off similar reactions.
To support our argument, we draw on a unique survey of Nigerian expatriates in Ghana. Critically, we conducted our survey both before and after the US announced the Nigerian immigration ban, and the survey instrument contained a conjoint experiment measuring attitudes towards potential new neighbors – a commonly used metric for social affinity (Schachter Reference Schachter2016; Auerbach and Thachil Reference Auerbach and Tariq2018). In the conjoint experiment, one neighbor option is “Americans,” which allows us to estimate any decrease in affinity toward American neighbors (increased anti-Americanism) as a result of the ban. Our conceptualization of anti-American attitudes is in line with recent work that has acknowledged the multi-dimensional nature of anti-Americanism. We follow Chiozza (Reference Chiozza2009, 37), who views anti-Americanism as an “ideational phenomenon,” which leads to citizens’ outside the USA’ to hold “American citizens, American democracy, American society, American values, or American symbols” in low opinion. We focus in this article on the effect of targeted policies (what the US does) Footnote 3 on attitudes towards American citizens.
Research design
We estimate the effect of the announcement of the United States’ immigration ban on attitudes towards Americans by comparing Nigerian expatriates in Ghana who completed our survey before the immigration ban’s announcement – data collected initially as a pretest that we launched in mid-December 2019 – to those who were recruited during the main phase of data collection in February 2020. This causal identification strategy, also known as the “Unexpected Event during Survey” (UEDS) design (Muñoz, Falcó-Gimeno, and Hernández Reference Muñoz, Falcó-Gimeno and Hernández2020), capitalizes on the fact that whether or not a respondent completed our survey before or after the event in question is as-if random with respect to the timing of the event. Thus, the group surveyed prior to the event serves as a control group to those surveyed after the event (the treatment group). Scholars have used this strategy to estimate the effects of a wide range of events including the effect of terrorist attacks on electoral outcomes (Balcells and Torrats-Espinosa Reference Balcells and Gerard2018) and attitudes towards immigrants (Legewie Reference Legewie2013; Eady and Breton Reference Eady and Charles2021) as well as the effect of an immigrant–integration-related court case on electoral outcomes (Bridgman et al. Reference Bridgman, Ciobanu, Erlich, Bohonos and Ross2021). Appendix Table A-1 in Supplementary material shows the balance for a range of variables between the two samples, including media consumption, providing support that treatment is as-if randomly assigned.
One key identification assumption for the UEDS strategy to support causal claims is that the event, as indicated in the name of the design, must be unexpected. In order for the pre-event survey group to function as a control group, it cannot have any exposure to the event, which would be the case if the event was widely anticipated. In the case of the immigration ban against Nigerians, solid evidence exists that the announcement was unexpected. While global media widely prognosticated that the USA would implement further travel and immigration restrictions against some countries, Nigeria’s presence on the list of countries whose citizens were now excluded was surprising. Even Nigeria’s top diplomat was “blindsided with the announcement of the visa restrictions by the U.S” (New York Times Feb 4, 2020). Appendix B in Supplementary material contains further reporting from Nigeria to bolster this claim.
General citizen internet users also do not appear to have expected the ban. Google trends data (see Figure 1) show essentially no search activity for the words “travel ban” before late January and then a large spike on February 1, 2020. Footnote 4 Interest in the ban experienced a smaller surge (on January 22, 2020) just prior to the official White House statement (on January 31, 2020) because reports anticipating the announcement had surfaced at this time. We do not expect this to have any meaningful impact on our analysis since the pretest data was collected prior to this early leak.
Google Search Trends for “Travel Ban” in Nigeria. The
$y$
-axis reflects search interest relative to the highest point (February 1) from December 1, 2019 to March 1, 2020. A value of 100 denotes the peak popularity for the search query in this period.
Corresponding to the condition that the pre-event respondents were not partially “treated” by anticipating the event, the postevent respondents should all have been exposed to the event. Given the importance of migration amongst Nigerians, we assume the immigration ban was a salient enough event that most Nigerians would have paid attention. Indeed, on February 1st, 2020, the news was front page “breaking news” on several major Nigerian news sites. We also searched six main Nigerian daily news publications, and all of them covered the Nigerian immigrant ban within the first week of its announcement. Although our respondents do not reside in Nigeria, the majority of them follow news in Nigeria: about 70% of our respondents spend at least 30 min per day following news from Nigeria while only 12% state they do not follow Nigerian news at all. These numbers are in line with research that shows that most expatriates follow news in their home country and do so using online versions of home-country media (Christiansen Reference Christiansen2004; Mattelart Reference Mattelart2009; Waldinger Reference Waldinger2015). We note that lack of knowledge of the ban would likely only work against us finding any treatment effect. We explore this option in additional analyses summarized in Appendix C, Supplementary material, disaggregating our sample by media consumption. Footnote 5
Finally, causal identification requires that there was no other event in the period between our pre- and post-ban samples that could have caused a change in attitudes towards Americans, leading us to wrongly attribute any changes we observe. To examine this assumption, we use the Wayback Machine to build a database of all of the top stories present on the website of one of Nigeria’s most popular national daily newspapers (The Punch). We supplemented this analysis through a content analysis of all Nigerian and Ghanaian news on Lexis-Nexis, which contained the word “United States” AND/OR “Trump.” We find only one potential story that could have had an effect: the killing of Qassem Soleimani on January 3rd. In Appendix D in Supplementary material, we further document our methods for investigating potential events, explain why we believe the Soleimani assassination is unlikely to have shifted Nigerians’ opinions, and conduct a robustness check by using a Christian-only subsample.
Data and methods
Social media companies such as Facebook collect and construct detailed data about their users. These data include demographic characteristics such as age, gender, location, and language use, but also information such as interests and, in some cases, professional background. Researchers have used targeted Facebook advertising to conduct surveys of employees at specific firms (Schneider and Harknett Reference Schneider and Kristen2019), and groups with specific demographic (Arcia Reference Arcia2014) or political (Jäger Reference Jäger2017) characteristics, demonstrating that social media allows researchers to study very specific and otherwise hard-to-reach populations. Critically for our project, Facebook provides advertisement categories on “expatriates” such as Nigerians living in Ghana. The “expatriate” group has been shown to provide a good proxy for emigrant/migrant populations (Zagheni, Weber, and Gummadi Reference Zagheni, Weber and Gummadi2017) and has been used to survey them (e.g. Pötzschke and Braun Reference Pötzschke and Michael2017).
We recruited our sample in Ghana via targeted Facebook advertisements of Nigerians in Ghana using the “expatriate” advertising target category provided by Facebook. When Nigerian Facebook users in Ghana clicked on the advertisement, they were directed to our study, which we carried out via Qualtrics. In total, we conducted three advertising campaigns. A pilot campaign (wave 1), lasting two days, took place from December 4, 2019 to December 6, 2019 and drew 129 respondents; these are the pre-event respondents. The next campaign, beginning February 7, 2020, ran for 10 days (wave 2) and was immediately followed by a 7-day campaign (wave 3), which was active until February 24, 2020. Footnote 6 While we made small adjustments to the survey content based on the pretest, the conjoint experiment module was not changed between survey periods. In the second and third campaigns combined, we recruited 598 respondents. Further survey information, including a CONSORT flow chart, is found in Appendix E, Supplementary material.
To the best of our knowledge, no comprehensive demographic data exist for Nigerians in Ghana. Thus, we cannot evaluate the extent to which our sample is representative of the Nigerian population in Ghana. Footnote 7 That said, we have substantial variation across demographic variables (See Appendix A in Supplementary material). Moreover, we used the same sampling technique to conduct a survey of Nigerians in Canada (not reported on in this study) and comparisons to Canadian Census data suggest good representativeness with respect to gender, age, and education.
Reflecting the facts that the young undertake migration and our survey excludes minors under the age of 18, the median respondent in our sample is 31 years old. Though we could not find reliable statistics on the gender ratio of Nigerian expatriates in Ghana, according to our sample, males predominate (71%). Our sample is also highly educated: 70% have at least some post-secondary education. Overall, relatively recent emigrants compose the bulk of our sample: the median respondent reported leaving Nigeria 5 years ago. Correspondingly, respondents generally maintain close ties to Nigeria: almost half of the respondents indicate they call their families in Nigeria at least several times a week, and over 60% report sending money back home.
We designed our survey to measure Nigerian emigrants’ attitudes in countries across the globe, including Canada, South Africa, the United Arab Emirates, and others. To that end, the survey instrument included a host of questions related to respondents’ migration history, cross-border ties, and attitudes towards Nigerian politics. Critically for this study of Nigerian expatriates in Ghana, the survey also included a conjoint experiment, originally designed to understand how Nigerian expatriates in different contexts vary their preferences for different types of neighbors, which allows us to assess Nigerians’ favorability towards Americans.
In our conjoint experiment, we present respondents with profiles of two hypothetical neighbors. Each of these neighbors has randomized values of the same four attributes. In addition to ethnicity/nationality – the focal item for this analysis – we included family status, occupation, and religion. The ethnicity/nationality attribute had seven different possible values. Three options were the largest Nigerian ethnic groups (Igbo, Yoruba, Hausa), and a fourth option was a Nigerian with no ethnic identity given. A fifth option was Ghanaian – a member of the host country majority. The final two were other migrant groups: Togolese, who are nationals of a country bordering both Nigeria and Ghana, and American, which we included as a reference category for possible cross-country comparisons.
After seeing the profiles, respondents were asked to choose which of the two neighbors they preferred. Additionally, we asked each respondent to separately rate on a 1–7 scale how much they would like to have each person as a neighbor.
Our survey asks each respondent to complete four conjoint choice tasks – well below the maximum number seen as feasible (Bansak et al. Reference Bansak, Hainmueller, Hopkins and Yamamoto2018). Figure 2 portrays a sample conjoint task. Footnote 8 To minimize order effects, the attribute order is randomized across respondents but remains constant for each participant to reduce cognitive burden. Footnote 9
Sample conjoint task.
Of our respondents, a total of 394 (80 in the pre-ban period and 314 in the post-ban period) persisted until the conjoint experiment, which was situated near the end of the survey. Since each respondent evaluated eight neighbor profiles, after omitting unanswered conjoint tasks, there are a total of 3,034 observations across the pre- and post-ban period for the forced-choice outcome, and 2,788 observations for the rating outcome.
Analysis and results
In conjoint analysis, attributes’ marginal means are average outcomes for each level of the attribute, all else equal. Per the UEDS design, we exploit the ban as an exogenous shock to identify the causal effect of the ban on favorability towards Americans among Nigerian expatriates. The effect is estimated by differencing the marginal means for participant responses before and after January 31st.
Formally,
$Y$
is the outcome (forced binary choice or rating),
$A \in $
$\{ American,Nigerian, \ldots ,Igbo\} $
is the ethnicity/nationality attribute,
$X$
represents all other attributes in the conjoint (occupation, family, religion) and the non-American levels of the ethnicity/nationality attribute, and
$T \in \{ 0,1\} $
denotes the treatment period, the difference between pre- and post-ban periods is
${\bar Y_{t = 1|a = American}} - {\bar Y_{t = 0|a = American}}$
, which we estimate as
$({\alpha _1} + {\beta _1} + {\delta _1}) - ({\alpha _2} + {\beta _2} + {\delta _2})$
from the following models:
$\widehat Y = {\alpha _1} + {\beta _1}{A_{American}} + {X}{\delta _1} + \varepsilon {\rm{,for\ all}}\ t = 0$
$\widehat Y = {\alpha _2} + {\beta _2}{A_{American}} + {X}{\delta _2} + \varepsilon {\rm{,for\ all}}\ t = 1$
Standard errors for each marginal mean are clustered by respondent.
Figure 3 displays the marginal means of all attribute levels at 90% and 95% confidence levels grouped by pre- and post-ban period for forced-choice and rating outcomes. As the literature expects (Duncan, Moehler, and Silver Reference Duncan, Moehler and Silver2015), Americans constituted the most popular potential neighbor group in the pre-ban period (marginal mean of 0.65). In the post-ban period, American popularity declined to 0.52. Preferences for other groups were as one would expect: engineers are substantially more popular than street vendors as potential neighbors; large extended families are disfavored over couples or families; and, since our sample is predominantly Christian (as is the host country Ghana), unsurprisingly, there exists a strong preference for Christian neighbors over Muslims.
Marginal means of attributes in neighbor choice and rating by pre- and post-ban period. Black and grey circles represent pre- and post-ban estimates, respectively. Thick horizontal lines represent 90% confidence intervals. Thin lines are 95% confidence intervals.
Figure 4 focuses on the differences for the ethnicity and national origin attribute and shows the 13 percentage point reduction in marginal preference for Americans is statistically significant. Moreover, the difference is only significant in the American group. That no other group witnessed a negative reaction is worth highlighting because it provides evidence that what we observe here is a backlash against Americans specifically rather than a more generalized rallying around national identity and increased distrust of members of all out groups.
Change in the evaluation of potential neighbors by ethnicity/nationality between the pre- and post-ban periods. Thick horizontal lines represent 90% confidence intervals. Thin lines are 95% confidence intervals.
Based on all three waves pooled, this 13-point difference is approximately the same size as the difference in preferences for having a “Christian” versus “Muslim” neighbor (13.5 points), and larger than the difference between a neighbor who is an “Engineer” as opposed to a “Street vendor” (8.5 points).
An examination of rating outcomes, which range from 1 to 7, reveals near-identical patterns. Figures 3 and 4 present rescaled rating marginal means and differences in these means, respectively, created by collapsing the original 7-point scale to one that ranges from 0 to 1. The average rating for American neighbors drops by 0.43 (from 5.20 to 4.77 on the original scale). This effect corresponds to a 0.24 standard deviation decrease from the pretreatment distribution of ratings. Both the rating and the choice results are robust to dropping problematic respondents (see Appendix F in Supplementary material). We further discuss the sensitivity of our results in Appendix G, Supplementary material.
Discussion and conclusion
How do those who are the target of discriminatory immigration restrictions react to being excluded? As we show, discriminatory migration policies can provoke a backlash among citizens of the targeted country (in our case, Nigeria). This finding bolsters previous work on anti-American sentiment that finds a tight link between how respondents think about the USA and how they feel about its people (Chiozza Reference Chiozza, Katzenstein and Keohane2006, 96). In sum, while rank-and-file American nationals are not directly responsible for the immigration ban and may not agree with it, in the eyes of many Nigerians, they represent the actions of the American state. Belligerent American foreign policy, especially in the Middle East since 9/11, has significantly lowered the approval of the USA (124). Our results suggest that discriminatory immigration policies may play a similar role, at least among some populations.
While the combination of a conjoint experiment administered both before and after the immigration ban and the unexpected nature of its announcement affords a unique opportunity to identify the effect these policies have on those they target, we note a few caveats and scope conditions of our reseach. Our sample – Nigerians who emigrated to Ghana – are clearly a select subset of Nigerians. Whether a representative sample of Nigerians in Nigeria would have yielded a stronger or weaker effect, we cannot ultimately answer. Arguably, as emigrants, our respondents may feel most directly targeted by immigration bans and may be most attuned to migration policy – raising the possibility that our findings are an overestimate relative to the effect one might find among Nigerians on average. However, in the case of Nigeria, even expatriates alone comprise a non-trivial population. While numbers are hard to pinpoint, between 5 and 20 million Nigerians currently reside outside Nigeria (OECD 2015; Ogen Reference Ogen2017). Moreover, migration appears to be on the mind of many Nigerians; a Pew Global Attitudes survey in 2018 found that 45% of Nigerians planned to leave Nigeria. Footnote 10
As we argue, the Trump migration ban does not constitute a case of normal migration policy; banning Nigerians as members of a nation state is an affront to their national honor. In fact, we would not expect to see the kind of backlash against Americans from normal changes in migration policy. Taken as an instance of national humiliation, our estimate might be a lower bound. As emigrants, those sampled have, by “voting with their feet,” acted in a way that reflects a distrust of the Nigerian state. Consonant with findings of other emigrant populations (Acosta et al. Reference Acosta, Rabadan, Ortiz and Waldinger2012; Waldinger Reference Waldinger2015, 91), our sample holds considerably more negative attitudes towards the Nigerian government than the Afrobarometer’s representative survey in Nigeria (see Appendix H in Supplementary material, which shows that, even when we demographically match our respondents to similar respondents from the Afrobarometer, our sample is much more negative toward Nigeria). Consequently, we would expect our sample to react less strongly than the average Nigerian.
We also highlight that unlike the Trump administration’s previous “Muslim Bans,” this ban did not claim to target Nigerians because of their religion (approximately half of Nigerians are Muslim with the other half Christian) but targeted Nigerians as nationals. The composition of our sample also supports a conclusion that this was chiefly about national identity rather than a backlash against anti-Muslim discrimination and supports our argument that what we find here is indeed a reactive nationalism. Matching the religious makeup of Ghana’s majority Christian population, the Nigerian expatriate population in Ghana is overwhelmingly Christian, and correspondingly only 10% of our sample are Muslim.
Finally, we note that like much of sub-Saharan Africa (Duncan, Moehler, and Silver Reference Duncan, Moehler and Silver2015), Nigerians have generally viewed the USA positively even under the Trump presidency. Footnote 11 This positive view of the US means that, prior to the ban, there was not a floor on a negative reaction to a statement made by the Trump administration. Unfortunately, our data do not allow us to say whether or not the effects we identified lasted beyond the immediate aftermath of the policy announcement or whether Nigerians returned to the strikingly positive evaluations of Americans we observed before the discriminatory migration policy went into effect.
Supplementary Material
To view supplementary material for this article, please visit https://doi.org/10.1017/XPS.2021.26
Data Availability Statement
The data, code, and any additional materials required to replicate all analyses in this article are available at the Journal of Experimental Political Science Dataverse within the Harvard Dataverse Network, at: https://doi.org/10.7910/DVN/V8NM9T.
Financial Support
Support for this research was provided by the Social Science and Humanities Research Council (SSHRC) Insight Development Grant, award no. 430–2018–0533.
Conflict of Interest
The authors declare that there is no conflict of interest.
