History 145 Social conditions 35 Gold mines and mining 26 Gold discoveries 23 Race relations 22 Social aspects 20 Chinese Americans 15 more ... Social life and customs 15 Frontier and pioneer life 14 Indians of North America 13 Economic conditions 12 Ethnic relations 12 Women 10 Manners and customs 9 Emigration and immigration 8 Legal status, laws, etc 8 Politics and government 8 African Americans 7 Chinese 7 Civil rights 6 Crimes against 6 In literature 6 Description and travel 5 Ethnic identity 5 Genocide 5 Government relations 5 Hispanic Americans 5 History and criticism 5 Missions 5 Pioneers 5 less ...