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History 67 Economic conditions 34 Social aspects 28 Economic development 25 Politics and government 21 Economic aspects 20 Social conditions 19 Sustainable development 19 Emigration and immigration 14 Colonies 13 Cultural property 13 Economic policy 13 Political aspects 13 Climatic changes 12 Religious aspects 12 Environmental aspects 11 International cooperation 11 Prevention 10 Documentary films 9 Economic integration 9 Government policy 9 Law and legislation 9 Islam 8 Management 8 Women 8 Foreign relations 7 Music 7 Social life and customs 7 Technological innovations 7 Terrorism 7