A long way to freedom crossword puzzle

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Across
  1. 3. states that refused the abolition of slavery
  2. 6. secret name of a person who helped the slaves
  3. 7. name of the river that separated free states from slave states
  4. 9. the president who abolished slavery
Down
  1. 1. the states that fought slavery
  2. 2. very difficult, exhausting
  3. 4. area of land that is cultivated
  4. 5. number of states that refused the abolition of slavery
  5. 6. house of a slave on the plantation
  6. 8. name of the star the fugitive followed to reach freedom