An inhabitant of America.
A citizen of the United States.
Pertaining to America, or to the United States.
The American people have waited long enough. – State of the Union Addresses of Jimmy Carter by Jimmy Carter
No, American, like you, eh? – Together by Robert Herrick (1868-1938)
The American, however, was indignant at the bare suggestion of this. – The Island Treasure by John Conroy Hutcheson