History 550 Politics and government 431 Social conditions 378 Economic conditions 221 Economic history 197 Social aspects 138 Foreign relations 126 更多 ... Diplomatic relations 124 Political aspects 117 History and criticism 98 Social life and customs 81 Economic policy 71 Manners and customs 68 Democracy 55 Motion pictures 53 Race relations 52 Civilization 51 Religious aspects 47 Political activity 45 Economic aspects 42 Women 42 Government policy 36 Ethnic relations 35 National security 34 Emigration and immigration 33 Influence 31 Islam 31 Presidents 31 Military policy 30 Political culture 30 少 ...