America First is best known as the slogan and foreign policy advocated by the America First Committee, a non-interventionist pressure group against the American entry into World War II, which emphasized American nationalism and unilateralism in international relations. The America First Committee’s membership peaked at 800,000 paying members in 450 chapters, and it popularized the slogan “America First”.[3] While the America First Committee had a variety of supporters in the U.S., the movement was muddled with anti-Semitic and fascist rhetoric.[18] Notable Americans who supported “America First” causes include Elizabeth Dilling, Gerald L. K. Smith,[19][20] and Charles Lindbergh,[21] while Dr. Seuss derided the policy in a number of political cartoons, linking it to Nazism.[22
The Ku Klux Klan (KKK) used the phrase America First at the organization’s peak in the 1920s, when racist, xenophobic sentiment was widespread;[13][14] it informed many of their members who ran for political office.[15] The Immigration Act of 1924 sponsored by Washington U.S. representative Albert Johnson proved to legislate xenophobia and white supremacy, excluding immigrants on the basis of ethnicity and national origin in an effort to preserve white racial demographics.[16] Johnson’s leading role in the immigration restriction bill elicited strong support from the KKK.[17]
Other usage
In mid-2016, while running for a Louisiana Senate seat, David Duke, former Grand Wizard of the KKK, publicly claimed that he was “the first major candidate in modern times to promote the term and policy of America first”[55] (although was preceded by Donald Trump).[25][33][34]
https://en.wikipedia.org/wiki/America_First_(policy)
https://en.wikipedia.org/wiki/America_First
https://en.wikipedia.org/wiki/America_First_Political_Action_Conference