| Primary / secondary source | Made during the era studied / a later account that interprets it |
| Reconstruction (to 1877) | Readmitting Southern states and redefining Black citizenship |
| Black Codes | Postwar Southern laws that controlled Black labor and barred Black jurors and testimony |
| Gilded Age | Late 1800s: shiny wealth covering deep inequality and corruption |
| Social Darwinism | Applying "survival of the fittest" to society to justify inequality (Spencer) |
| Settler colonialism | Settlers seize Native land first; the army then secures it |
| Roosevelt Corollary (1904) | Claimed a US right to intervene in Latin America |
| Dollar diplomacy | Control through bank loans instead of troops |
| New immigrants / nativists | Southern and Eastern Europeans and Asians / people who opposed mass immigration |
| Lost Cause | Myth glorifying the Confederacy and denying slavery's role in the war |
| Muckrakers | Journalists who exposed abuses (Sinclair, Riis, Baker) |
| Trust | Monopoly or cartel controlling an industry |
| Associationalism | Hoover's voluntary, non-government approach to relief |
| Containment | Stop the spread of communism without direct war (Kennan) |
| MAD | Nuclear deterrence: either side could destroy the other |
| Redlining | Grading minority areas "D" (red) on maps and denying them loans |
| Great Society | Johnson's 1964 programs against poverty and racism (Medicare, Medicaid) |
| Stagflation | High inflation plus economic stagnation at the same time (1970s) |
| Supply-side economics | Cutting taxes to spur investment; gains said to "trickle down" |
| Bush Doctrine | Unilateral, preemptive strikes against threats |