cool puzzle

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Across
  1. 4. to invalidate and make void
  2. 5. to divide into two sharply contrasted beliefs or opinions
  3. 6. ___of 1812
  4. 9. The way Native Americans went to get to oklahoma
  5. 11. located in San Antonio
  6. 14. 7th president
  7. 15. ________ Trail
  8. 16. fast way of traveling upriver
Down
  1. 1. Tax placed on imported goods
  2. 2. Native Americans moved here
  3. 3. protected western hemisphere
  4. 7. man made canal that went to Buffalo, New York
  5. 8. The most common cause of death on the Oregon trail
  6. 10. First National_______
  7. 12. ________ Destiny
  8. 13. to withdraw formally from an orginization or alliance