Which nation was the first to immigrate to the United States?

The earliest inhabitants of America were Indians and Eskimos (self-proclaimed Inuit), who were Mongolians who migrated from Asia to the New World. Among them, Indians began to migrate from Northeast Asia to North America about 40,000 to 50,000 years ago, and then gradually moved south. At that time, the Bering Strait between Northeast Asia and Alaska was connected by a continental bridge, which became a passage for human beings and various animals to migrate. Later, after the ice sheet that once covered the whole of Canada melted, a smooth corridor was opened to the east of the Rocky Mountains, through which some Siberian Mongolian hunters came to the American Plain continuously, which was distributed throughout South America about 6,543,800 years ago. Eskimos migrated from Asia to America much later than the first Indians who arrived in America. They mainly live in northern North America and the Arctic, and make a living by hunting and fishing. Eskimos have small hands and feet, and there are many people with type B blood, while Indians have almost no people with type B blood.