The number of immigrants in America has increased.

In 20 10, the total population of the United States was 3 10/00000, making it the third most populous country in the world, next only to China and India. The population growth rate of the United States is 0.97%, which is the fastest among developed countries. Immigration is the main reason for the rapid population growth in the United States. In the past 200 years, whites, blacks and Asian yellow people have all immigrated to the United States except Indians.

So, the answer is: immigration; Indians; Black people.