History 17 Politics and government 17 Description and travel 14 History -- 9 Politics and government -- 8 Foreign relations -- 7 Vietnam war -- 7 more ... Culture -- 5 Social conditions 5 Economic conditions 4 Foreign relations 4 Social life and customs 4 Speeches, addresses, etc., American 3 Boundaries 2 Buddhism -- 2 Civil -- 2 Civil right 2 Culture 2 Customs 2 Economic development 2 Hijacking of aircraft 2 International relations 2 Military relations -- 2 Political persecution -- 2 Refugees -- 2 Riots 2 Speeches, addresses, etc 2 Speeches, addresses, etc., English 2 Tourist trade -- 2 World War 2 less ...