cool puzzle

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Across
  1. 4. Native Americans moved here
  2. 5. Manmade canal that went to Buffalo, New York
  3. 7. Fast way of traveling Upstream
  4. 8. First National ______
  5. 10. _____ Trail
  6. 12. _______ Destiny
  7. 13. The most common cause of death on the Oregon Trail
  8. 15. to divide into two sharply contrasted beliefs or opinions
Down
  1. 1. located in San Antonio
  2. 2. 7th President
  3. 3. The way Native Americans went to get to Oklahoma
  4. 6. Protected Western Hemisphere
  5. 9. to withdraw formally from an organization or alliance
  6. 11. a tax placed on imported goods
  7. 14. to invalidate and to make void; to refuse to follow