The United States of America (United States, USA, or US, for short) is a country in North America and the world's sole superpower. It is bordered on the north by Canada. The United States is where the majority of the action in FlashForward takes place, and the country of citizenship of most of the main characters.
The United States was among the countries hard-hit by the Global Blackout because at the time of the blackout, it was during the work day. (Compare to, for instance, the People's Republic of China, which suffered relatively few casualties because it was nighttime and most people were sleeping.) ("Gimme Some Truth")
The United States' governmental law enforcement and intelligence arms include the Federal Bureau of Investigation, the Central Intelligence Agency, Immigration and Customs Enforcement, and the National Security Agency. Its political leaders include the President and Vice President of the United States.
The capital of the United States is Washington, D.C., and its largest city is New York City. The second-largest city in the United States, Los Angeles, California, is where most of the action of FlashForward takes place.