African Americans 22 History 17 Frontier and pioneer life 7 Race relations 6 African American authors 5 Frontier and pioneer life in literature 5 Intellectual life 5 更多 ... American literature 4 History and criticism 4 Social conditions 4 African Americans in popular culture 3 African American soldiers 2 African American troops 2 African American women journalists 2 African Americans in literature 2 Biography 2 Family 2 Historiography 2 In literature 2 Politics and government 2 African American arts 1 African American pioneers 1 African American soldiers -- West (U.S.) -- Biography 1 African American soldiers -- West (U.S.) -- History -- 19th century 1 African American soldiers -- West (U.S.) -- History -- 20th century 1 African American women journalists -- California -- Nevada County -- Correspondence 1 African Americans - West (U.S.) - Social conditions 1 African Americans -- California -- Social conditions -- 19th century 1 African Americans -- West (U.S.) -- Biography 1 African Americans -- West (U.S.) -- History 1 少 ...