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Blood Types and the Population. O positive is the most common blood type. Not all ethnic groups have the same mix of these blood types. Hispanic people, for example, have a relatively high number of Oâs, while Asian people have a relatively high number of Bâs. The mix of the different blood types in the U.S. population is:
Rare blood types are O negative and AB negative. B negative and AB  positive are also fairly rare blood types. O negative is known as  the universal donor blood type because â¦ it is compatible with any  other blood type.