Race and Ethnicity: State of Oregon, Population by Race, American Indian or Alaskan Native
From 1890 to around 1950, the Native American population in Oregon held fairly steady. Growth accelerated in the 1960s and 1970s, and by 1980 the native American population was about 30,000.
Once the Census Bureau allowed people to identify as Native American either alone or in combination with other races in 2000, the American Indian or Alaskan Native Population more than doubled—in part because of this change in the definition of those included among American Indian or Alaska Native population.
The Census Bureau defines American Indian or Alaska Natives as persons "having origins in any of the original peoples of North and South America (including Central America) and who maintain tribal affiliation or community attachment." Therefore, part of the growth in the Native American population is the result of international migration.