4th Six Weeks
| 1. Grand Army of the Republic | 32. Haymarket Riot |
| 2. the "bloody shirt" | 33. American Federation of Labor |
| 3. Tweed Ring | 34. Settlement House |
| 4. Credit Mobilier | 35. new immigration |
| 5. Whiskey Ring | 36. American Protective Association |
| 6. Compromise of 1877 | 37. Chautauqua |
| 7. Stalwart | 38. Morrill Act |
| 8. Half-Breed | 39. Comstock Law |
| 9. Pendleton Act | 40. Women's Christian Temperance |
| 10. Mugwamps | 41. Eighteenth Amendment |
| 11. "Crime of '73" | 42. muckrakers |
| 12. Bland-Allison Act | 43. Sierra Club |
| 13. Greenback Labor Party | 44. Yosemite National Park |
| 14. People's Party (Populists) | 45. Ballinger-Pinchot Affair |
| 15. Sherman Silver Purchase Act | 46. Seventeenth Amendment |
| 16. crop-lien system | 47. Elkins Act |
| 17. Populism | 48. Hepburn Act |
| 18. grandfather clause | 49. Northern Securities Act |
| 19. Plessy v. Ferguson | 50. Muller v. Oregon |
| 20. Chinese Exclusion Act | 51. Lochner v. New York |
| 21. "Billion Dollar Congress" | 52. Triangle Shirtwaist Fire |
| 22. McKinley Tariff | 53. Meat Inspection Act |
| 23. stock watering | 54. Pure Food and Drug Act |
| 24. trust | 55. Newlands Act |
| 25. Union Pacific Railroad | 56. Underwood Tariff Bill |
| 26. Central Pacific Railroad | 57. Federal Reserve Act |
| 27. Grange | 58. Federal Trade Commission Act |
| 28. Wabash Case | 59. Clayton Anti-trust Act |
| 29. Bessemer Process | 60. Federal Farm Loan Act |
| 30. Social Darwinism | 61. Seaman's Act |
| 31. Gospel of Wealth | 62. Workingmen's Compensation Act |