Presidential succesion

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Across
  1. 5. 9th president
  2. 6. 13th president
  3. 9. 16th president
  4. 12. 3rd president
  5. 13. 14th president
  6. 15. 2nd president
  7. 16. 8th president
  8. 17. 5th president
Down
  1. 1. 1st president
  2. 2. 6th president
  3. 3. 17th president
  4. 4. 18th president
  5. 7. 4th president
  6. 8. 11th president
  7. 10. 10th president
  8. 11. 15th president
  9. 12. 7th president
  10. 14. 12th president