History 35 Social conditions 12 Gold mines and mining 6 Motion pictures 6 Social aspects 6 Gold discoveries 4 Manners and customs 4 more ... Motion picture industry 4 Race relations 4 Social life and customs 4 African Americans 3 Antiquities 3 Chinese Americans 3 Ecology 3 Economic conditions 3 Ethnic relations 3 Government policy 3 Indians of North America 3 International relations 3 Japanese Americans 3 Politics and government 3 Production and direction 3 Relations 3 Civilization 2 Community activists 2 Cultural pluralism 2 Economic history 2 Education 2 Emigration and immigration 2 Environmental conditions 2 less ...