Goodbye, Columbus?

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Across
  1. 3. argument that involves many people who strongly disagree about something
  2. 5. when everyone agrees on an action
  3. 6. having the power to cause changes
  4. 9. existed or happened at an earlier time than
  5. 11. ruined the surface of (something) especially with writing or pictures
  6. 12. native; occurring naturally in an area
  7. 13. the deliberate killing of people who belong to a
  8. 14. having no pity : cruel or merciless
  9. 16. likely to cause people to argue or disagree
Down
  1. 1. racial, political, or cultural group
  2. 2. pictures or words painted or drawn on a wall, building, etc
  3. 4. one who takes control by force
  4. 7. happening as the first one in a series of similar events
  5. 8. or someone else)
  6. 10. a journey especially by a group of people for a specific purpose
  7. 11. destruction of a large number or large part of
  8. 15. an attitude or opinion