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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:
1 The main blood group system is ABO, with four blood types: A, B, O, AB. 2  Rhesus system, for which you can be positive or negative, is the second most important with regard to blood transfusions. 3  In total there are 32 recognised blood group systems, which all have either positive or negative indicators.