The United States of America (English: United States of America), referred to as "America", is a federal constitutional country composed of Washington, D.C., 50 states, Guam and many other overseas territories. Its main part is located in central North America. In the first edition of the CIA World Survey, the total area of the United States was 93,726,665,438+0996,65,438+0997, and it was revised to 9,630,000 square kilometers (plus the sovereignty of the United States in the Great Lakes, estuaries, harbors, inland seas and other coastal waters).
North America was originally inhabited by Indians. /kloc-At the end of 0/5, Spain, the Netherlands, Britain and other countries began to immigrate to North America. 1775, the American people's war of independence against the British colonists broke out. 1776 On July 4th, the Second Continental Congress was held in Philadelphia. George Washington was the commander-in-chief of the Continental Army, and the United States of America was formally established through the Declaration of Independence.
From 186 1 to 1865, the civil war broke out. Abraham lincoln led the free states in the north to defeat the slave states in the south. Since then, the United States has ended "one country, two systems" and started to implement liberal capitalism in an all-round way, and embarked on the road of rapid development.
The United States is a highly developed capitalist country, leading the world in politics, education, economy, military affairs, culture and innovation. As the world's largest military power, its higher education level, scientific research technology level and aviation industry are also well-deserved first in the world. Its large investment in scientific research, the number of research universities and enterprises and the rich scientific research achievements are exemplary in the world. At the same time, the United States also has a series of world-renowned enterprises such as Apple, Microsoft, Dell, Hewlett-Packard and Boeing.