Movement of Peoples Cryptic Crossword

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Across
  1. 3. Pioneered agriculture after conviction (9)
  2. 5. Empire's act of claiming territory (12)
  3. 6. Trade route between three regions (10)
  4. 10. A pardoned convict (10)
  5. 13. Mass development of industries (16)
  6. 16. Convict ship stationed when jails were full (4)
  7. 17. Chooses to live abroad permanently (11)
  8. 18. Fencing off open fields (9)
Down
  1. 1. One transported for crimes (7)
  2. 2. The end of slavery (9)
  3. 4. Ships carrying captives (7)
  4. 7. Sold at these upon arrival in America (7)
  5. 8. 1788 fleet to Australia (10)
  6. 9. Forced labor system ended in 1865 (7)
  7. 11. Moves livestock over distances (6)
  8. 12. Southern crop spun into fabric (6)
  9. 14. Disease that devastated populations (8)
  10. 15. Aboriginal resistor (8)