Changes over time

Parent Categories (55)

1. Agricultural Techniques
2. Agriculture
3. Architecture
4. Artifact Value
5. Attitudes towards the unmarried
6. Biodiversity
7. Career
8. Career Opportunities
9. Career Patterns
10. Caste System
11. Chronological Order
12. Ecosystem Dynamics
13. Emissions
14. Environmental Issues
15. Executive Branch
16. Family
17. History
18. History of Computers
19. Immigration
20. Immigration Policy
21. Indigenous Tribal Government Relations with the U.S. Government
22. Industrial Location
23. Influence on Public Opinion
24. Iowa
25. Labor productivity
26. Land Degradation
27. Land Use
28. Land Use and Development
29. Life Expectancy
30. Local History
31. Marriages and Relationships
32. Media Influence
33. Oceans
34. Personal Development
35. Personal Reflections
36. Pittsburgh
37. Population trends
38. Portuguese Empire
39. Prison life
40. Role of Church
41. Role of Church in Education
42. Schooling
43. Society and Population
44. Spanish Empire
45. Spanish Language
46. Spanish treatment of Indigenous people
47. Standard of living
48. Survey analysis
49. Technological Impact
50. Trade Routes
51. Transportation
52. U.S. Foreign Policy
53. United States Immigration Policy
54. US foreign policy
55. Water Quality