| Term | Definition |
| Isolationism | a policy of nonparticipation in international economic and political relations |
| Collective Security | a system for international peace |
| Internationalism | a policy of cooperation and involvement among nations |
| Imperialism | any instance of aggressive extension of authority |
| Washington's Farewell Address | preaches isolationism, wanted to focus on America |
| Monroe Doctrine | an American foreign policy opposing interference in the Western hemisphere from outside powers |
| The "White Man's Burden" | a Kipling poem used as a justification for imperialism |
| Manifest Destiny | the United States should stretch from "sea to shining sea" |
| "Seward's Folly" | People thought that when Seward bought Alaska it was a bad choice |
| Open Door Policy | Stated that all nations should have equal access to chinese trade |
| Spheres of Influence | areas in which countries have some political and economic control but do not govern directly |
| Yellow Journalism | sensationalized and often untrue journalism |
| Remember the Maine | an incident involving a sunken battleship that sparked the Spanish-American War in Cuba |
| superpower | a state powerful enough to influence events throughout the world |
| empire | a group of countries under a single authority |
| Guantanamo Bay | Military base granted to the US in Cuba which is now used as a prison |
| globalization | growth to a global or worldwide scale |
| insurgency | an organized rebellion |
| Expansionism | expanding the territory or the economic influence of a country |
| Commodore Matthew Perry | the commodore of the u.s. navy who compelled the opening of Japan to the west |
| Alfred Thayer Mahan | leading supporter of american imperialism who was in the u.s. navy |
| Queen Liliuokalani | the Hawaiian queen who was forced out of power by a revolution started by American business interests |
| The Rough Riders | The first volunteer cavalry regiment, led by Teddy Roosevelt, and led the Battle of San Juan Hill |
| Commodore George Dewey | a commodore during the Spanish-American War who captured the Philippines and Guam |
| Rudyard Kipling | English author of novels and poetry who was born in India (1865-1936) |
| Emilio Aguinaldo | The Rebel leader in the Philippines during the Spanish-American War. |
| Theodore Roosevelt | Leader of Rough Riders who went on to build the Panama Canal and be the 26th US president |
| William Randolph Hearst | Was a famous journalist who promoted yellow journalism |
| Joseph Pulitzer | Was a famous journalist who promoted yellow journalism, Pulitzer Prize is named after him. |
| Mexican American War | armed military conflict between the United States and Mexico from 1846 to 1848 |
| Spanish American War | A war in which the US gave independence to the Philippines and to Cuba from Spain |
| Annexation of Hawaii | When the US occupied Hawaii with Military presence and claimed it as a part of the USA |
| Boxer Rebellion | A 1900 Uprising in China aimed at ending foreign influence in the country. |
| Persian Gulf War | a war fought between a coalition led by the United States and Iraq to free Kuwait from Iraqi invaders |
| Iraq War | A war fought to end Sadaam Hussein's influence in Iraq and disarm them of WMD's |
| Afghanistan War | US Military Operation in Afghanistan to find Osama Bin Laden and to destroy Al Qaeda |
| Building of the Panama Canal | a ship canal 40 miles long across the Isthmus of Panama built by the United States (1904-1914) |
| Philippine Insurrection | A rebellion before the Spanish American War when there were tensions between the Filippinos and the US |
| Peacekeeping in Bosnia | A republic from Eastern Europe where fighting broke out between the Serbs, Croats, and Muslims, US tried to keep peace there |
| Purchase of Alaska | Bought from the Russians, many people thought it was a bad purchase, but it turned out to hold many resources |
| Bush Doctrine | After 9/11, US policy that we would preemptively attack any terrorist or the states that harbor him |