| Term | Definition |
| Progressive Movement | Activists who wanted to change the social and economic ills caused by rapid industrialization. |
| Immigrants | Came to the United States in search of job opportunities. |
| Anti-imperialists | Believed the United States was expanding its overseas colonies as a result of racism. |
| Imperialists | Wanted to spread democracy, Christianity, gain new markets for goods, and military bases. |
| Panama Canal | Facilitated trade and military ship movements from the Atlantic to the Pacific. |
| Yellow Journalism | Stretches the truth and embellishes news to gain support. A major cause behind the Spanish American War. |
| World War I Causes | Imperialism, Militarism, Nationalism, and Alliances. |
| Selective Service Act | Originated during WWI to raise enough soldiers via the draft. Originally men aged 21-36. |
| League of Nations | Post-World War I alliance system created to stop a world war from happening again. The United Stated refused to join so as not to be drawn into another war. |
| Prohibition | The attempt to stop the manufacture, sell, and transportation of alcohol that started during World War I in attempt to save grain for the soldiers. Led to the creation of bootlegging, speakeasies, and organized crime during the 1920s. |
| Great Depression Causes | Buying on credit, drop in farm prices, over-speculation on the stock market, and uneven distribution of wealth. |
| Social Security Act | Created old age pensions and disability during the Great Depression as a part of the New Deal. |
| Axis Powers during WWII | Germany, Italy, and Japan |
| Pearl Harbor | Japanese attack on Hawaiian Islands in response to the U.S. stoppage of oil supplies and scrap iron to Japan. Additionally, the Japanese feared the U.S. was the only country able to stop Japanese imperialism in the Pacific. |
| FDR and the Great Depression | Greatly increased government spending programs in contrast to Hoover's encouragement of private and local relief efforts. |
| Tripartite Pact | Made Germany and Japan alliances. Thus, the U.S., by declaring war on Japan, was to be drawn into the war in Europe. |
| island hopping | Allied strategy in the Pacific which allowed smaller islands to be bypassed while focusing troops and equipment on more important ones. |
| Manhattan Project | FDR initially feared the Germans would develop an atomic bomb first and authorized this program to create one for the United States. |
| Atomic Bomb | Truman decided to drop this weapon in order to save thousands of American lives by forgoing a planned invasion of the Japanese islands. |
| Korematsu v. United States | The Supreme Court's decision to uphold the constitutionality of the Japanese-American internment camps. |
| Berlin Blockade | Spurred the Cold War and the policy of containment by the United States. |
| Cuban Missile Crisis | The closest the United States and the Soviet Union ever came to fighting a nuclear war. |
| Korean War | A UN effort, led by the United States in which the boundaries between North and South did not change significantly following the war. |
| Gulf of Tonkin Resolution | Gave President Johnson the ability to expand U.S. military involvement in Vietnam without a Congressional declaration of war. |
| Tet Offensive | Turning point in the Vietnam War in which the American public decided the war could not be won, as no part of South Vietnam was secure. |
| Vietnamization | The turning over of the Vietnam War to the South Vietnamese Army (ARVN). |
| Fall of Saigon | The MAJOR result of the end of the Vietnam War in which the South fell completely to communism. |
| Brown v. Board of Education | Ended the separate but equal doctrine established by Plessy v. Ferguson. |
| Watergate | The scandal that caused the resignation of President Nixon due to a certain impending impeachment. |
| Star Wars | Defense program to prevent nuclear missiles from reaching the United States through an outer space missile defense system. Greatly increased defense spending, but was not a successful program. |
| Gulf War | The U.S. response to Iraq's invasion of Kuwait in an attempt to protect the flow of oil into the West. |
| Department of Homeland Security | Federal cabinet created in response to the September 11 attacks on the United States. |
| neutrality | The United States original response to the outbreak of World War I |
| urban living conditions during the Second Industrial Revolution | overcrowded, poor sanitation, diseases, crime, vice, ghettos reflecting specific cultures |
| World War II | Caused the Great Depression to end |
| Containment Policy | U.S. objective following World War II in which we tried to stop the spread of communism |
| television coverage | During the Vietnam War, this brought the brutality of the war into the homes of Americans |
| American Soldier frustration in Vietnam | inability to know who the enemy was |
| Martin Luther King, JR. | believed in non-violent protest to promote Civil Rights |
| Civil Rights Movement | ended segregation, opened the political process to African Americans, and gave African Americans a larger sense of ethnic pride |
| LBJ | took over the presidency after the assassination of JFK |