The first known use of the name "America" dates to 1507, when it appeared on a world map produced by the German cartographer Martin Waldseemüller in Saint Dié, Lorraine (now northeastern France). On his map, the … 查看更多內容

The 48 contiguous states and the District of Columbia occupy a combined area of 3,119,885 square miles (8,080,470 km ). Of this area, 2,959,064 square miles (7,663,940 km ) … 查看更多內容

The United States is a federal republic of 50 states, a federal district, five territories and several uninhabited island possessions. It is the world's oldest surviving federation. It is a federal republic and a representative democracy "in which majority rule is … 查看更多內容

Population
The U.S. Census Bureau reported 331,449,281 residents as of April 1, 2020, making the United States the third most populous nation in the world, after China and India. According to the Bureau's U.S. Population Clock, … 查看更多內容

Indigenous peoples and pre-Columbian history
It is generally accepted that the first inhabitants of North America migrated from Siberia by way of the Bering land bridge and arrived at least 12,000 years ago; however, some … 查看更多內容

According to the International Monetary Fund, the U.S. gross domestic product (GDP) of $22.7 trillion constitutes 24% of the gross world product at market exchange rates and over … 查看更多內容

The United States is home to a wide variety of ethnic groups, traditions, and values, and exerts major cultural influence on a global scale. Aside from the Native American, Native Hawaiian, and Native Alaskan populations, nearly all Americans or their … 查看更多內容