What is the historical event that led to the large-scale immigration of whites and blacks to North America?

After Columbus discovered the New World, white people immigrated to North America on a large scale!

Columbus discovered the new continent, and the rich resources of North America attracted the attention of white people! In order to obtain resources for your own enjoyment!

Western rulers, exile prisoners to North America and let them exploit resources! And ship it back to Europe!

The mass migration of blacks is due to the movement of selling blacks!

The rich resources in North America make white people drool! More and more white people are entering North America to become farmers!

At this time, the population of North America is insufficient, and white people have turned their eyes to Africa, which is populous and very backward!

Plunder a large number of young and strong blacks there and sell them to North America!