The United States is a federal constitutional republic consisting of 50 states and 1 federal special zone. They are located almost entirely in the Western Hemisphere with 48 continental states, the capital is Washington, D.C., the largest city is New York. The United States is located in the middle of North America, bordering the Pacific Ocean to the west, the Atlantic Ocean to the east, Canada to the north, and Mexico to the south. There are 14 territories and acreage up to 3.79 million square miles and 328.3 million inhabitants (2019). The United States is the 3rd or 4th largest country in terms of total area and 3rd largest by population size in the world.