In history class today, I heard the teacher say that Americans were formerly British. And the first president of the United States was British. . Why did Britain and the United States separate late

In history class today, I heard the teacher say that Americans were formerly British. And the first president of the United States was British. . Why did Britain and the United States separate later?

Before 1620, America was a place where Indians lived. Later, some British Puritans (Britain followed the Anglican Church at that time) left Britain due to religious persecution, looking for the Americas discovered by Columbus in the legend. Beginning in 1620, the British Puritans slowly arrived in America and established colonies. At this time, because everyone came from the British, the colonies belonged to the United Kingdom and had to pay taxes to the British government. But later, with the development of the economy, the contradiction between the colonial people and the British government became more and more serious, and the American War of Independence broke out. The United States received help from France. Of course, they themselves also made arduous efforts and finally defeated the so-called powerful Britain, the "Empire on which the Sun Never Sets," established the United States of America in 1776.

So not only the first President Washington was American, most of the early Americans were from the British.