The former U.S.President who got involved with the River of Doubt project was Teddy Roosevelt.

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After his crushing election defeat in 1912 as a third-party candidate, former president Theodore ("Teddy") Roosevelt set his sights on a grand adventure, the first descent of an unmapped rapids-choked tributary of the Amazon aptly titled the "River of Doubt." Together with Brazil's most famous explorer, Candido Mariano da Silva Rondon, Roosevelt accomplished a feat that belongs in the annals of great expeditions.

The Former U