Why are there so many white people in North America?

The distribution of whites has evolved for a long time, mainly due to geographical and climatic reasons, but North American whites should be explained separately.

Caucasians are generally distributed in areas with high latitude and cold climate, with long sunshine time but low radiation, resulting in white skin, high height, high nose and light pupil color.

The main indigenous people in North America belong to the yellow race (Indians), and the white people in North America are immigrants from Europe, which is the product of the era of geographical discovery. At the same time, a large number of blacks immigrated as slaves.