general information :
the united states of america (U.S, USA) – it is a federal constitutional republic comprising fifty states and federal district.
the country is mostly situated in central north america, where is forty-eight contiguous states and Washington D.C., the capital district, lie between Pacific and Atalntic Oceans, bordered by Canada to the north and Mexico to the south. The state of Alaska is in the northwest of the continent. The state of Hawaii is an archipelago in the mid-Pacific.