Crossword puzzle

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Across
  1. 4. (5 letters) - Engineering structures that raise and lower ships 85 feet to navigate the canal's elevation changes.
  2. 6. (7 letters) - Chief engineer John Frank who revolutionized the canal project by implementing a lock-based system.
  3. 7. (9 letters) - U.S. president who most aggressively pursued American imperial expansion and the canal project.
  4. 8. (8 letters) - The primary purpose of the canal, facilitating international trade and shipping.
  5. 10. (5 letters) - The steamship that made the canal's first official transit on August 15, 1914.
Down
  1. 1. (8 letters) - American president who championed the Panama Canal and won the Nobel Peace Prize.
  2. 2. (7 letters) - French engineer Ferdinand de ___ whose canal company failed before the American project succeeded.
  3. 3. (5 letters) - The largest of three lock complexes, named after the lake created by damming the Chagres River.
  4. 5. (7 letters) - The narrow strip of land connecting North and South America where the Panama Canal was built.
  5. 8. (7 letters) - The most challenging section of the canal, requiring massive excavation through a mountain ridge.
  6. 9. (7 letters) - One of two oceans connected by the canal.