Across
- 3. purchased in 1819
- 4. the idea that white americans were able to settle the entire continent of North America
- 7. What did Thomas Edison invent?
- 8. What helped provide immunity to smallpox?
- 10. bought in 1783
- 11. Who invented the germ theory?
- 14. What helped build ships and buildings?
- 15. provided transportation to people in a faster way?
Down
- 1. was purchased in 1803
- 2. Who created the radio?
- 5. purchased in 1845
- 6. bought in 1848
- 9. what enabled the rapid separation of seeds from fibers?
- 12. was bought in 1846
- 13. what did James Watt invent?