| Term | Definition |
| Foreign Policy | A nation's plan for its relations with other countries |
| Domestic Policy | A nation's plan for its internal affairs |
| Treaty | An official agreement between two independent countries |
| Sphere of Influence | The external areas where a country is able to dominate or control |
| hemisphere | one-half of the earth's sphere |
| Western Hemisphere | the half of the earth's sphere that includes North and South America |
| Eastern Hemisphere | The half of the earth's sphere that includes East Asia |
| Southern Hemisphere | The one-half of the earth's sphere that is SOUTH of the equator |
| Northern Hemisphere | The one-half of the earth's sphere that is NORTH of the equator |
| Imperialism | When one country extends its control over other countries' economy or territory |
| Monroe Doctrine | The announcement by US President James Monroe that Europe is no longer allowed to make colonies in the Western Hemisphere |
| Isthmus | a narrow strip of land connecting two larger land areas |
| rivalry | intense atmosphere of competition between two opponents |
| fate | destiny or inevitable ending of events |
| Open Door | US idea that all countries should be allowed to trade in China and not just colonizers |
| Secretary of State | US cabinet officer who advises the president in foreign policy |
| The "Black Ships" | Japanese name for the dark iron ships of the US fleet that arrived in the 1850s |
| Great White Fleet | Term for the US Navy in the 1890s because of their paint job |
| Boxers | Chinese patriots who opposed foreign interference and colonization |
| Rough Riders | US unit of cavalry in the Spanish-American War |
| Yellow Journalism | Printing sensational but dubious stories to gain readers for a publication |
| jingoism | extreme patriotism usually to support a war |
| patriotism | love and loyalty to one's own country |
| Yellow Jack | common term for the Yellow Fever disease |
| Corollary | an added change to a document |
| Roosevelt Corollary | President Roosevelt's claim that the USA could intervene anywhere in Latin America |
| Latin America | The area south of the USA where countries derive their languages from Spanish, French, or Portuguese |
| "Big Stick" | term that means a strong reaction, such as a military response |
| Dollar Diplomacy | To expand US influence in Latin America by investing money and buying property |
| Battleship | The largest type of warship, known for its massive cannons |
| cede | to give over ownership or control of something, often land |
| annexation | to officially claim new territory and add it to your country |