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.