Parent Category: United States

United States of America, referred to as the United States, Mak Kwok, m the country, English also often called the United States, U.S., The U.S., USA, The States or America, America is named after the Italian navigator Amerigo. The nickname "Uncle Sam." Chinese formerly known as the "United States country." 

The United States of America is a constitutional federal republic composed of 50 states and a Federal Territory SAR countries, the East Atlantic Ocean, west Pacific, north of Canada, south of Mexico. The United States is a multi-cultural and multi-ethnic country; land area of ​​more than 9.62 million square kilometers, ranking the world's third or fourth; the total population of over three hundred million people, ranking third in the world. July 4, 1776, the Continental Congress in Philadelphia formally adopted the Declaration of Independence, declaring the United States was born. Since 1870, the U.S. national economy, the highest in the world, is one of the five permanent members of UN Security Council, today's gross domestic product (GDP) of more than 20% of the world. The enormous influence of its economic, political, scientific, technological, military, entertainment and many other areas are to lead the world, is currently the world's only superpower.