Expanding west

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Across
  1. 3. a 2000 mile long trail
  2. 6. a search for gold
  3. 7. officially ended the Mexican-American war
  4. 8. the members of Joseph Smiths church
  5. 10. cowboys who managed the large herds of cattle
  6. 12. a group that got stranded in the Sierras
Down
  1. 1. 11th US president
  2. 2. used pans to wash nuggets out of loose rock
  3. 4. agents
  4. 5. gold seeking migrants
  5. 9. fur traders and trappers
  6. 11. an abandoned mission near San Antonio