| Term | Definition |
| Open Door Policy (1899) | US attempt to protect its trading rights in China |
| Imperialism | US foreign policy from 1890's-WWI based on the access to markets, raw materials and trade |
| Big Stick Diplomacy | Teddy Roosevelts effort to promote US interests in Latin American |
| Panama Canal | Teddy Roosevelt intervened in Latin American affairs in order to acquire a short cut from the Atlantic Ocean to China and US colonies in the Pacific Ocean |
| Result of the Spanish American War | US emerges as world power with colonies in Latin America and in the Pacific |
| Yellow Journalism | Gained public support for the Spanish-American War |
| Roosevelt Corrolary | Policy that the US would use "international police power' to enforce good behavior in Latin America |
| Reason for US Neutrality 1st 3 years of WWI | Maintain freedom of the seas for trade with European nations |
| Unrestricted submarine warfare | Reason for US involvement in WWI, Germany threatened freedom of the seas |
| Schneck v. USA (1919) | 1st amendment right to free speech may be limited during war |
| "Clear and present danger test" | Criteria used to limit free speech during war |
| Woodrow Wilsons 14 Points | The President's vision for US involvement to promote principles such as peace in the post war world |
| Treaty of Versailles | Was rejected by congress and the American people because it would involve the US in foreign affairs |
| League of Nations | Predecessor of the (UN) United Nations, the USA did not join due to a desire to remain neutral |
| Nativism | After WWI this dislike and distrust of immigrants increased |
| USS Maine | Battleship whose explosion in Cuba was a cause of the Spanish-American War |
| Sinking of the Lusitania | Cruise ship that was sunk by German submarines and helped bring the US closer to involvement in WWI |