History 618 Description and travel 207 Gold discoveries 196 Social conditions 167 Politics and government 98 Race relations 95 Histoire 93 更多 ... Social life and customs 89 Ethnic relations 83 Frontier and pioneer life 78 African Americans 72 Mexican Americans 71 Overland journeys to the Pacific 62 Missions 54 Gold mines and mining 53 Travel 53 Indians of North America 47 Social aspects 38 Découvertes d'or 37 Emigration and immigration 36 Immigrants 36 Chinese Americans 34 Economic conditions 32 Minorities 31 Voyages to the Pacific coast 31 Civilization 30 Descriptions et voyages 30 Ethnic identity 29 Pioneers 29 Jews 25 少 ...