The early days of the US

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Across
  1. 7. The skin of an animal
  2. 8. Many soldiers togehter
  3. 10. Other word for to choose
  4. 11. The place at the airport where goods get checked.
  5. 12. A person who is among the first to explore a new country
  6. 13. The killing of a lot of people
Down
  1. 1. The date on which an institution was founded.
  2. 2. A heavily built wild ox
  3. 3. A formally concluded agreement between states.
  4. 4. Other word for soldiers
  5. 5. Behaviour when you hurt someone
  6. 6. A quantity of precious metals or valuable objects.
  7. 9. You can find it in the ground and can be valuable.