Who was the first African-American president?
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African Americans are an ethnic group by residency.
African Americans are an ethnic group by residency .
Who was the first African-American president?</s>African Americans are an [unused1]ethnic group by residency                [unused2] .
Who was the first African-American president?</s>African Americans are an ethnic group by residency.
Who was the first African-American president?</s>African Americans are an [unused1]ethnic group by residency                [unused2] .
Who was the first African-American president?</s>African Americans are an ethnic group by residency .
Who was the first African-American president?</s>African Americans,0,African Americans,African Americans,instance of,[unused1]ethnic group by residency[unused2],[unused1]ethnic group by residency[unused2],0,African Americans,[unused1]ethnic group by residency[unused2],0,[unused1]ethnic group by residency[unused2]
Who was the first African-American president?</s>African Americans,0,African Americans,African Americans,instance of,ethnic group by residency,ethnic group by residency,0,African Americans,ethnic group by residency,0,ethnic group by residency