The United States of America (USA) is a federal constitutional republic located on the North American continent, between the Pacific and Atlantic oceans. The country was founded in 1776 after its leaders declared independence from the United Kingdom. Starting in the early 20th century, the US became a major world power, one of the first located outside of Eurasia.
The United States is home to three of the Big Ten megacorporations: Ares Macrotechnology, based in Detroit, Michigan, Horizon, based in Los Angeles, California, and Page Industries, based in New York City, New York.
The United States heartland fell victim to a nuclear attack in 2050, which saw downtown Chicago destroyed by a stolen nuclear suitcase bomb. A wall was erected around the Chicago Exclusion Zone and the area was sealed. The quarantine was officially lifted in 2075, though the government still monitors those entering and leaving the Exclusion Zone at secure military checkpoints.