Are African Americans Native Americans

In USA, there are too many ways to categorize Americans, so people have begun to modify the noun American with an indicator as to where their ancestors were born.

For example, the term African American indicates that at least some ancestor came to the United States from Africa.

As another example, the term Native American indicates that at least some ancestor was already on United States soil before Caucasian people 'conquered' the land.

Since 1492 for USA, tens of thousands of people have come to the land, and produced children who today, can be described as Americans with the modifiers that represent their ancestors.

You can see that it doesn't take too many generations -- usually noted as 20 years -- for people's ancestors to contribute lots of modifiers to the noun American.

Yes, it's possible that a person could be an African-Native American. In the world, however, most humans have mixes of ancestors according to the lands where the ancestors were born.