The United States of America (USA) is a federal constitutional republic composed of Washington, D.C., 50 states, and several overseas territories such as Guam. The mainland USA is located in central North America, with a total area of 9.834 million square kilometers and a population of 320 million. English is the predominant language.

The Revolutionary War ended in 1783, with Britain recognizing the independence of the 13 colonies.The US Constitution was adopted in 1787, forming a federal state.The American Civil War occurred from 1861 to 1865.From 1803 to 1959, the USA expanded its territory through purchases and wars.

In August 2018, M-Lab ranked the USA 20th globally in broadband speed.