Who was the first African-American president?
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African Americans are part of the American subclass.
African Americans are one of the ethnic groups in the United States , where Americans live .
Who was the first African-American president?</s>African [unused1]Americans                [unused2] are part of the American subclass.
Who was the first African-American president?</s>African Americans are part of the American subclass.
Who was the first African-American president?</s>African [unused1]Americans                [unused2] are one of the ethnic groups in the United States , where
Who was the first African-American president?</s>African Americans are one of the ethnic groups in the United States , where Americans live .
Who was the first African-American president?</s>African Americans,0,African Americans,African Americans,subclass of,[unused1]Americans[unused2],[unused1]Americans[unused2],has part(s),African Americans,[unused1]Americans[unused2],0,[unused1]Americans[unused2]
Who was the first African-American president?</s>African Americans,0,African Americans,African Americans,subclass of,Americans,Americans,has part(s),African Americans,Americans,0,Americans