Causes World War, 1939-1945 29 History 25 Foreign relations 20 Politics and government 11 United States 10 World War, 1914-1918 10 Diplomatic history 8 War 8 Iraq War, 2003 7 Sources 7 Juvenile literature 6 World War 6 World politics 6 Case studies 5 Korean War, 1950-1953 5 Political aspects 4 World war, 1939-1945 4 1918-1945 3 Campaigns 3 September 11 Terrorist Attacks, 2001 3 Civil war 2 Cold War 2 Economic aspects 2 Great Britain 2 History 20th century 2 Iraq 2 Israel-Arab War, 1967 2 Military aspects 2 Moral and ethical aspects 2