Economic conditions -- 10 Politics and government -- 5 Economic policy -- 4 Foreign economic relations -- 2 Foreign relations -- 2 History 2 History -- 2 more ... Social conditions -- 2 Chinese -- 1 Commercial policy -- 1 Communism -- 1 Economic conditions 1 Government policy -- 1 Grain trade -- 1 Physical geography -- 1 Political parties -- 1 Social life and customs -- 1 Social policy 1 foreign relations -- 1 less ...