Do you know the origin and history of the United States?

The origin and history of the United States are:

1. Origin: The original inhabitants of North America were Indians.

2. History: The United States was originally a settlement of Indians. At the end of the 15th century, Spain, the Netherlands, France, the United Kingdom and others immigrated here one after another. Before the 18th century, Britain established 13 British North American colonies on the Atlantic coast of the United States. In 1775, the American people's War of Independence broke out against the colonial rule of the British Empire.

On July 4, 1776, the Second Continental Congress was held in Philadelphia. George Washington, commander-in-chief of the Continental Army, issued the Declaration of Independence, declaring the formal establishment of the United States of America. The War of Independence ended in 1783, and Britain recognized the independence of 13 colonies. In 1787, the United States Constitution was adopted and a federal state was established.

Topography

The terrain of the United States is highly variable, with the terrain being higher in the west and lower in the east. There is a coastal plain along the east coast, which is wide in the south and narrow in the north, extending to New Jersey. There are also some glacial sedimentary plains in Long Island and other places. Behind the coastal plain are the undulating foothills that extend to the 1,830-meter-high Appalachian Mountains in North Carolina and New Hampshire.

To the west of the Appalachian Mountains is the relatively flat Central Plains of the United States, which is also home to the Great Lakes and the Mississippi-Missouri River Basin, the fourth largest river basin in the world. West of the Mississippi River, the topography of the Interior Plains begins to rise, eventually ending in the Great Plains, a vast area of ??central America with few topographic features.