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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 World, and the rich resources in 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 black people is due to the movement of selling black people!

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

At this time, the population of North America was insufficient, and the white people turned their eyes to Africa with a large population and very backward!

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