The United States is a country of immigrants.Newly arrived immigrants tend to settle near one another for social comfort and support,thus forming small,semi-isolated populations.The frequencies of the ABO blood types in these populations are often very different from the population of the mother country.This is due to the fact that:

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The small size of the immigrant populations is likely to result in non-random sampling of the ABO blood types. The small subset of individuals who immigrate to the United States may not represent a random sample of their mother population in terms of their ABO blood type frequencies. This can result in differences in ABO blood type frequencies between the immigrant population and the mother country. Mutation rates and natural selection are not likely to be major factors in causing differences in ABO blood type frequencies between immigrant populations and their mother countries.

The United States Is a Country of Immigrants