Across
- 4. Forced relocation of Native Americans, 1830s
- 6. 1941 Japanese assault on US naval base
- 8. Shift to mechanized manufacturing, 18th century
- 11. Allied landing in Normandy, 1944
- 13. Global conflict from 1939 to 1945
- 18. Severe worldwide economic downturn, 1930s
- 19. 2013 terrorist attack during a race
- 22. Catholic Church's inquest in Spain
- 25. Iconic 1969 music event
- 27. Political scandal in the US, 1970s
- 28. Colonial rebellion against British rule
- 29. 1969 space mission's touchdown on lunar surface
- 30. Advocacy for racial equality in the US
Down
- 1. 1962 US-Soviet confrontation
- 2. 1066 conflict, Norman conquest of England
- 3. Collapse of ancient Western Rome
- 5. Political upheaval in France, late 18th century
- 7. 1986 nuclear plant accident in Ukraine
- 9. 2001 terrorist attacks on the US
- 10. 1945 nuclear attack in Japan
- 12. Chinese anti-foreigner movement, 1900
- 14. 1920s period of cultural change
- 15. Major Civil War battle, 1863
- 16. Conflict in Vietnam, 1955-1975
- 17. Ban on alcohol in the US, 1920s
- 20. US development of atomic bombs
- 21. 1989 reunification of East and West Germany
- 23. Competition between US and USSR in space exploration
- 24. 1773 protest against British taxation
- 26. 1929 stock market crash