The United States is the largest power in the world today, and it is of great significance to understand and study its history. Write down the important historical facts in American history that you k

The United States is the largest power in the world today, and it is of great significance to understand and study its history. Write down the important historical facts in American history that you know (such as major historical facts)

For example: Originally a British colony, Washington led the American Revolutionary War from 1775 to 1783; the first U.S. Constitution was promulgated in 1787, establishing the political system of separation of powers; in modern times, the second industrial revolution Core technologies such as electric lights, airplanes, and the theory of relativity first appeared in the United States; the United States is a country of immigrants, absorbing a large number of immigrants from other countries and regions around the world, contributing to economic development, and making American culture rich and colorful; and so on. Just be inspired by what you say.