"The AFC was established on September 4, 1940, by Yale Law School student R. Douglas Stuart, Jr. (son of R. Douglas Stuart, co-founder of Quaker Oats), along with other students, including future President Gerald Ford, future Peace Corps director Sargent Shriver, and future U.S. Supreme Court justice Potter Stewart.[3] Future President John F. Kennedy contributed $100, along with a note saying "What you all are doing is vital."[4][5] At its peak, America First claimed 800,000 dues-paying members in 450 chapters, located mostly in a 300-mile radius of Chicago.[1]"
A bunch of little Hitlers, these dudes were. /s
My grandfather served in the trenches of France. In the interlude between wars, many Americans opposed joining in yet another war in Europe.
Serious students of history knew that Europe was a story of war, after war, after war. (Hundred Years War, Thirty Years War, War of Roses, etc)
The fact that many Americans opposed yet another war in Europe, was NOT support for Hitler.