Columbia subject headings:
Harvard subject headings:
Ethnicity--United States--History--Sources.
Ethnicity--United States--History.
United States--Emigration and immigration--History--Sources.
United States--Emigration and immigration.
United States--Ethnic relations--Sources.
United States--Ethnic relations.
Princeton subject headings:
Ethnicity--United States--History--Sources.
Ethnicity--United States--History.
United States--Emigration and immigration--History--Sources.
United States--Emigration and immigration.
United States--Ethnic relations--Sources.
United States--Ethnic relations.