This well-researched historical monograph began as a doctoral dissertation at Dallas Theological Seminary. It offers an insider's history of a most important chapter in the story of American evangelicalism. The author assesses what he calls a major ‘rift’ between the ‘dispensational’ and ‘covenantal’ schools of evangelicalism, a rift he contends did not take place until the ‘crucial’ period 1936–44 (p. 19). Before this time, he avers, one struggles in vain to find clear lines of demarcation between these groups. (It appears that dispensationalists did not even refer to themselves as such until 1936.) Evangelicals had often combined the teachings of both schools in a largely Reformed, dispensational, hybrid Protestantism. During and after this time, however, battle lines were drawn more clearly. Subterranean tensions surfaced in a series of minor skirmishes, which culminated in a report by Southern Presbyterians on the dangers of the dispensational system. (Mangum has published this report in an appendix to the book.) Consequently, dispensationalists became much less Reformed. Their flagship seminary in Dallas, which was founded on a largely Reformed-Presbyterian basis, soon attracted far more independent and Baptist evangelicals. And evangelical leaders began to oppose dispensational and covenantal ways of reading Scripture as irreconcilable alternatives. Mangum tends to view the past rather narrowly through the zoom lens of his own research interests. He reduces fundamentalism to a binary combination of ‘Presbyterian’ and ‘Niagara’ fundamentalists. He renders evangelicalism an all too North American, late-modern, Reformed, reactionary child of fundamentalism. And he presents covenantal biblical thought as strictly Reformed, thus neglecting its other Protestant and Catholic iterations. Nevertheless, this splendid book is must for anyone interested in twentieth-century evangelical movements.