The United States shares land borders with Canada (to the north) and Mexico (to the south), and a territorial water border with Russia in the northwest. The contiguous forty-eight states are otherwise bounded by the Pacific Ocean on the west, the Atlantic Ocean on the east, and the Gulf of Mexico to the southeast. Alaska borders the Pacific Ocean to the south and southwest, the Bering Strait to the west, and the Arctic Ocean to the north, while Hawaii lies far to the southwest of the mainland in the Pacific Ocean.

The history of the United States started with the arrival of Native Americans in North America around 15,000 BC. Numerous indigenous cultures formed, and many disappeared in the 1500s. ... In 1776, in Philadelphia, the Second Continental Congress declared the independence of the colonies as the "United States".

Joseph Robinette Biden Jr. (born November 20, 1942) is an American politician serving as the 46th president of the United States. A member of the Democratic Party, he served as the 47th vice president from 2009 to 2017 under Barack Obama and represented Delaware in the United States Senate from 1973 to 2009.

In October 2010, Biden said Obama had asked him to remain as his running mate for the 2012 presidential election, but with Obama's popularity on the decline, White House Chief of Staff William M. Daley conducted some secret polling and focus group research in late 2011 on the idea of replacing Biden on the ticket with Hillary Clinton. The notion was dropped when the results showed no appreciable improvement for Obama, and White House officials later said Obama had never entertained the idea.