"American, English-speaking white person," 1941, southwestern U.S., from Anglo-American. Anglo was used similarly of native, English-speakers in Canada from 1800 and Britain from 1964.
Entries linking to anglo
Anglo-American n.
"English person who has settled in North America," 1738, from Anglo- + American. Originally often in contrast to German immigrants; later (1830s) in contrast to French-Canadians, Louisiana French, Spanish Mexicans. As an adjective from 1797, "pertaining to the English who have settled in America;" the meaning "pertaining to both England and the United States" is from 1812.