What are the three ethnic groups that make up the U.S. population?

Now in the United States there are people belonging to representatives of more than 100 ethnic groups. But they were united by ethnographers into three ethnic groups:
1. Americans of the United States (this includes the descendants of various immigrants for whom English became their native language. This is 9/10 of the total population, white and black).
2. Transitional immigrant groups (citizens who have recently moved to the United States to live).
3. Aborigines (Indians, Eskimos, etc.).