History 20 Politics and government 7 African Americans 6 Asian Americans 5 Depressions 5 Discoveries in geography 4 Documentary films 4 Emigration and immigration 4 History and criticism 4 Kings and rulers 4 Music 4 Musical form 4 Social life and customs 4 Style, Musical 4 Asians 3 Discovery and exploration 3 Immigrants 3 Jazz 3 Discrimination raciale 2 Histoire 2 Race discrimination 2 Race relations 2 Technological innovations 2 Writing 2 racial discrimination 2 American Government 1 Americanization 1 Américains d'origine latino-américaine 1 Américains d'origine mexicaine 1 Art, American 1