The United States of America (USA) is a federal republic composed of 50 states, a federal district, five major self-governing territories, and various possessions. The 48 contiguous states and federal district are in central North America between Canada and Mexico, with the state of Alaska in the northwestern part of North America and the state of Hawaii comprising an archipelago in the mid-Pacific. The territories are scattered about the Pacific Ocean and the Caribbean Sea. At 3.8 million square miles (9.8 million km2) and with over 324 million people, the United States is the world’s third largest country by total area (and fourth largest by land area) and the third most populous. (Source: Wikipedia)