<P> A 2002 study found an average of 18.6% European genetic contribution and 2.7% Native American genetic contribution (with standard errors 1.5% and 1.4% respectively) in a sample of 232 African Americans . Meanwhile, in a sample of 187 European Americans from State College, Pennsylvania, there was an average of 0.7% West African genetic contribution and 3.2% Native American genetic contribution (with standard errors 0.9% and 1.6% respectively). Most of the non-European admixture was concentrated in 30% of the sample, with West African admixture ranging from 2 to 20%, with an average of 2.3% . </P> <P> In 1958 Robert Stuckert produced a statistical analysis using historical census data and immigration statistics . He concluded that the growth in the White population could not be attributed solely to births in the White population and immigration from Europe, but was also due to people identifying as white who were partly black . He concluded that 21 percent of white Americans had some recent African - American ancestors . He also concluded that the majority of Americans of known African descent were partly European and not entirely sub-Saharan African . </P> <P> More recently, many different DNA studies have shown that many African Americans have European admixture, reflecting the long history in this country of the various populations . Proportions of European admixture in African - American DNA have been found in studies to be 17% and between 10.6% and 22.5% . Another recent study found the average to be 21.2%, with a standard error of 1.2% . </P> <P> The Race, Ethnicity, and Genetics Working Group of the National Human Genome Research Institute notes that "although genetic analyses of large numbers of loci can produce estimates of the percentage of a person's ancestors coming from various continental populations, these estimates may assume a false distinctiveness of the parental populations, since human groups have exchanged mates from local to continental scales throughout history ." </P>

What is the percentages of races in the united states