Across
- 3. the dominant South American civilization of the past
- 7. the purpose for which Mound Builders built mounds
- 9. both the Incas and Aztecs were conquered by this European people
- 10. one of the buildings attacked by terrorist-hijacked airliners on September 11, 2001
- 12. the type of dwelling in which related families of Iroquois lived
- 17. ocean located to the east of the United States
- 20. the Native American people that lived in the deserts of the American Southwest
- 22. country that borders the United States to the south
- 23. payment made periodically by one state or ruler to another, especially as a sign of dependence
- 25. the height of a location above sea level
- 26. the first space shuttle that orbited the earth and returned safely back to the United States
Down
- 1. country that borders the United States to the north
- 2. war that caused widespread protests in the United States during the late 1960s and early 1970s
- 4. early South American civilizations were centered around this mountain range
- 5. waterway control of which was given to Panama by the United States in 1999
- 6. last name of the first American to orbit the earth in 1962
- 8. nation with which Cuba reestablished diplomatic relations on June 30, 2015
- 11. line of latitude along which Ecuador is located
- 13. a formal withdrawal from a nation or organization
- 14. name of the dog launched into space by the Soviets on Sputnik II
- 15. monster hurricane that was the worst natural disaster in U.S. history
- 16. ocean located to the west of the United States
- 18. the important social movement that brought much change to the United States during the 1960s
- 19. Canadian province that was the focus of a separatist movement during the 1980s and early 1990s
- 21. the offering needed by the Aztec god Huitzilopochtli in order to make the sun rise each day
- 24. the largest center of Mississippian culture