United States [Note 2] (USA; in English, United States or US), [Note 3] whose official name is the United States of America (USA; in English, United States of America or USA), [ 11] It is a sovereign country constituted in a federal constitutional republic composed of fifty states and a federal district. Most of the country is located in the environment of North America - where there are its 48 contiguous states and Washington D. C., the Federal District - between the Pacific and Atlantic Oceans. Limited with Canada to the north and with Mexico to the south. The state of Alaska is in the northwest of the continent, limits with Canada to the east, separated from Russia to the west by the Bering Strait. The State of Hawaii is a Polynesian archipelago in the middle of the Pacific Ocean and is the only one in its states that is not found in America. The country has several unincorporated territories in the Caribbean and in the Pacific. With 9.83 million square kilometers, [4] and with more...