How many British descendants are there in America?

This doesn't count. Indians lived in the early American continent. When Europeans came to discovery of america, they immigrated there in large numbers, so many Americans were descendants of the original British. The descendants of the British are the majority, and of course there are descendants of other European countries such as the Netherlands, Spain and France. Because Louisiana in the United States was once a colony of Spain, new york was the earliest colony of the Dutch, and France also had a few colonies in the United States. France helped the United States defeat Britain in the War of Independence, so there were some descendants of them. As for other European countries, of course, the United States is a melting pot of people! Black people are also an important part of Americans. China people have now become an important part of Americans.