Causes Political aspects History 59 Politics and government 32 Slavery 26 Antislavery movements 13 Foreign relations 13 more ... Iraq War, 2003-2011 11 Petroleum industry and trade 10 Secession 8 Social conditions 8 War 8 World War, 1914-1918 8 Race relations 7 Rhetoric 7 Social aspects 7 World politics 7 Deception 5 Government policy 5 Influence 5 Moral and ethical aspects 5 Sectionalism (United States) 5 September 11 Terrorist Attacks, 2001 5 African Americans 4 Economic aspects 4 Ethnic relations 4 Genocide 4 Holocaust, Jewish (1939-1945) 4 Jews 4 Military aspects 4 less ...