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What is the abbreviation of America?

Usa is the United States, UnitedStatesofAmerica, abbreviated as usa.

The full name of the United States is the United States of America, which is a federal constitutional country. The main part of the United States is located in the middle of North America. The United States used to be inhabited by Indians. /kloc-At the end of 0/5, the Netherlands, France, Spain and other countries immigrated to North America. 1775, the American War of Independence broke out, and 1776, the United States of America was proclaimed.