The United States of America (USA), commonly referred to as the United States (US), America, or simply the States, is a federal republic consisting of 50 states, 16 territories, a federal district, and various overseas extraterritorial jurisdictions. The 48 contiguous states and the federal district of Washington, D.C., are in central North America between Canada and Mexico. The state of Alaska is the northwestern part of North America and the state of Hawaii is an archipelago in the mid-Pacific. The country also has five populated and nine unpopulated territories in the Pacific and the Caribbean. At 3.79 million square miles (9.83 million km2) in total and with around 316 million people, the United States is the fourth-largest country by total area and third largest by population. It is one of the world's most ethnically diverse and multicultural nations, the product of large-scale immigration from many countries. The geography and climate of the United States is also extremely diverse, and it is home to a wide variety of wildlife.
Paleo-indians migrated from Asia to what is now the US mainland around 15,000 years ago, with European colonization beginning in the 16th century. The United States emerged from 13 British colonies located along the Atlantic seaboard. Disputes between Great Britain and these colonies led to the American Revolution. On July 4, 1776, delegates from the 13 colonies unanimously issued the Declaration of Independence. The ensuing war ended in 1783 with the recognition of independence of the United States from the Kingdom of Great Britain, and was the first successful war of independence against a European colonial empire. The current Constitution was adopted on September 17, 1787. The first 10 amendments, collectively named the Bill of Rights, were ratified in 1791 and guarantee many fundamental civil rights and freedoms.
A high-net-worth individual (HNWI) is a person with a high net worth. In the western and primarily American private banking business, these individuals typically are defined as having investable finance (financial assets not including primary residence) in excess of US$1 million.(Capgemini 2007)
According to Forbes 2013 ranking of the world's billionaires, Nigerian business magnate Aliko Dangote with a net worth of $16.1 billion is the world's richest black person. The other Blacks on the list are Nigeria's Mike Adenuga with $4.7 billion, South African gold magnate Patrice Motsepe with $2.9 billion, and American Oprah Winfrey at $2.8 billion.
From 2001 to 2003, Forbes listed American television network executive Bob Johnson as a billionaire, but dropped him after his fortune was split in his divorce.]when?[ He returned to Forbes Billionaire list in 2007 with a net worth of $1.1 billion. In 2008 Johnson's wealth dropped again, this time to approximately $1.0 billion and by 2009 he fell off the list again.