One of the mysteries of the English language finally explained.
A person who contends that the interests of the United States should take precedence over those of other nations; an American having (excessively) nationalistic or isolationist views. Also: a member or supporter of the America First Committee (1940–1) (now historical).
1920s; earliest use found in The Chicago Tribune. From America First [adjective] + -er.
America Firster/əˌmɛrɪkə ˈfəːstə/
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