Crossword puzzel

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Across
  1. 5. something that isn't fair
  2. 8. trying to expand slave states
  3. 9. striking violently against another
  4. 11. not constitutional
  5. 12. date mexico attacked
Down
  1. 1. the state in which mexico attacked
  2. 2. oppressive government rule
  3. 3. expands territory
  4. 4. month of the mexico attack
  5. 6. armed conflict between nations
  6. 7. country that attacked
  7. 10. unexpected inconvenience