Final answer:
The 'America First' slogan was associated with the Ku Klux Klan, known for white supremacy and exclusionary 'Americanism.'
Explanation:
'America First' was the slogan of the Ku Klux Klan. The Klan, particularly during the 1920s, promoted white supremacy, anti-immigrant sentiments, and a version of 'Americanism' that excluded certain groups like African Americans, Catholics, Jewish people, and immigrants from Southern and Eastern Europe.
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