Avenue U (Culver) is part of a rapid transport system within New York, the United States. The United States of America is part of the North American region in the continent of the Americas. The United States of America is believed to have been named after Amerigo Vespucci, the Italian explorer also known as Uncle Sam. It is in the Northern Hemisphere and is 9.6 million square kilometres in size. The primary language spoken is English; the capital city is Washington, D.C., and the main currency used is the U.S. Dollar.