America and Britain are not father and son. Part of the territory of the United States was originally a British colony, so the United States has a certain British descent. The United States was originally inhabited by Indians. By the end of 15, Spain, Netherlands, France and Britain began to immigrate to North America. By 1773, Britain had established 13 colonies.

1775 The War of Independence broke out. 1776 On July 4th, the Declaration of Independence was adopted and the United States of America was formally proclaimed. The federal constitution was promulgated in 1787, and Washington became the first president in 1789. In the 100 years after 1776, the territory of the United States almost expanded by 10 times.

American physical geography.

The topography of the United States is varied, with high terrain in the west and low terrain in the east. There are coastal plains on the east coast, which are wide in the south and narrow in the north, extending to New Jersey and Long Island, and there are also some glacial sedimentary plains. Behind the coastal plain is a hilly area with undulating terrain, extending all the way to the Appalachian Mountains in North Carolina and New Hampshire, with an altitude of 1, 830 meters.

To the west of the Appalachian Mountains is the central plain of the United States, with relatively flat terrain. The Great Lakes and the Mississippi River Basin, the fourth largest river in the world, are also located here. To the west of the Mississippi River, the topography of the internal plain began to rise, and finally it entered the great plain with a vast area and few topographical features in the central United States.

Refer to the above? China's Consular Service Network-American National Survey