What races are Americans and British?

Now most English people are Anglo-Saxons. Anglo-Saxon is a branch of ancient Germanic tribes, which originally lived in Northern Europe, jutland, Danish Islands and the northwest coast of Germany. From the 5th century to the 6th century, both the Anglo-Saxon tribes migrated from the North Sea to the island of Great Britain, and in the following three or four hundred years, the two tribes merged to form the Anglo-Saxon. Through conquest and assimilation, the Anglo-Saxons and the "aborigines" (Celts) of Great Britain, together with the "Danes" and "Normans" who immigrated later, merged together for a long time.