The full form of USA is "United States of America". It is a country in North America, bordered by Canada to the north, the Atlantic Ocean to the east, the Gulf of Mexico to the south, and the Pacific Ocean to the west. The USA is a federal republic of 50 states, with a total geographical area of 9,833,517 sq. km. and a total population of 331,002,600 as of 2020. The country has the largest economy in the world, which mainly comprises industrial and service sectors. The abbreviation "USA" is limited in use and is mostly found in proper nouns, such as the names of media sources like the newspaper USA Today, the cable television channel USA Network, and websites like USAhockey.com.