US Waterways

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Across
  1. 7. inland port cities grew in the Midwest along these
  2. 8. explored by the Spanish
  3. 9. served as a highway for explorers, settlers, and immigrants
  4. 10. forms part of the Northeastern border with Canada, connects the Great Lakes to the Atlantic Ocean
Down
  1. 1. used to transport farm and industrial products
  2. 2. provided French and Spanish with exploration routes to Mexico
  3. 3. explored by Lewis and Clark
  4. 4. early exploration destination
  5. 5. gateway to the west
  6. 6. forms the border with Mexico