The short form the United States is also standard. Other common forms include the U.S., the USA, and America. Colloquial names include the U.S. of A. and the States. Columbia, a once popular name for the United States, was derived from Christopher Columbus; it appears in the name "District of Columbia".The standard way to refer to a citizen of the United States is as an American. Though United States is the formal appositional term, American and U.S. are more commonly used to refer to the country adjectivally ("American values," "U.S. forces"). American is rarely used in English to refer to people not connected to the United States.
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