Origins of the word "OK"

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Across
  1. 2. The President associated with popularizing the use of "OK" in political contexts ...
  2. 4. A synonym for "OK" that starts with the letter "F" ...
  3. 5. The term "OK" may have originated from the Choctaw word ...
  4. 6. The Native American tribe associated with the Choctaw language ...
  5. 7. Term for "OK" often used to express agreement ...
  6. 11. An abbreviation often suggested as the origin of "OK" in the 19th century ...
  7. 13. The state where the Boston Morning Post, where "OK" first appeared, was published ...
Down
  1. 1. The theory that "OK" originated from the initials of a railroad freight agent ...
  2. 3. The modern-day and widely accepted meaning of "OK" ...
  3. 8. A synonym for "OK" that starts with the letter "A"...
  4. 9. The first name of the editor who may have coined "OK" in the Boston Morning Post ...
  5. 10. How is the theory suggesting that "OK" originated from the phrase "au quai" associated with which language?
  6. 12. Which is the language of theory that "OK" comes from the phrase ... meaning "all good."
  7. 14. The number of letters in the word "origin" ...