What brought about the concept of the anglo-saxon race?

The Anglo-saxon race was brought about by a mixture of people from central and eastern Europe, as well indigenous British people in the 5th century ad. As a race, the people were researched heavily by Henry Cabot lodge. the Anglo-Saxon people came into the annals of history from the fifth century, and resulted from a mixture of a Germanic tribe, and indigenous people of the land, who adopted aspects of the Anglo-saxon culture.

Idk, but try searching it up •_•