The United States of America, commonly referred to as the United States, America, and sometimes the States, is a federal republic consisting of 50 states and a federal district. The 48 contiguous states and Washington, D.C., are in central North America between Canada and Mexico. Wikipedia

Hawaii is the most recent of the 50 U.S. states and joined the Union on August 21, 1959. It is the only U.S. state located in Oceania and the only one made up entirely of islands. It is the northernmost island group in Polynesia, occupying most of an archipelago in the central Pacific Ocean. Wikipedia