Theodore Roosevelt was the president who pushed hardest for it.
Jimmy Carter was the US president when the Panama Canal was given away.
It was President Woodrow Wilson that was president when the Panama Canal was finished. in 1914.
He is most responsible for beginning the canal's construction. His company (The New Panama Canal Company) began construction in 1878. Construction was halted though because of problems with engineering and disease. The canal was eventually sold to the US for $40 million. He is also responsible for the Suez Canal, by the way.
Erie Canal
Theodore roosevelt
Theodore Roosevelt
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President Carter
Theodore Roosevelt
Eisenhower
Theodore Roosevelt