In a faux review following the main narrative, presented as written by (fictitious) Dr. Homer Whipple of New York University, we learn more about the background of the alternate history in which Hitler emigrated to the United States. Without Hitler's leadership, the Nazi Party fell apart in 1923 and the Communist Party of Germany succeeded in fomenting a German communist revolution in 1930. As this alternate history continues, there is reference to a "Greater Soviet Union" which took over the United Kingdom in 1948, and whose influence is growing in Latin America by 1959. The fact that Whipple refers to World War I as "the Great War" implies that there has been no equivalent of World War II in this world. The core element in the historical backstory of "Lord of the Swastika" is a nuclear apocalypse but Whipple gives no indication about such weapons really existing in this alternate reality.