In December 1913, Theodore Roosevelt went on a trip to Brazil right after his reelection. He was given the opportunity to explore an uncharted river named Rio of doubt. The trip they went on, they were expecting to be a lot easier than it was. They were guided by Candido Rondon who was one of Brazil’s best guides. Roosevelt caught a bad case of malaria. When they finished charting the river Roosevelt wrote a book called Through the Brazilian Wilderness. The River of Doubt was renamed Rio Roosevelt and a branch of the river was named Rio Kermit.