Final answer:
President Theodore Roosevelt sent the Great White Fleet on a worldwide tour to demonstrate American naval power, assert the United States as a global superpower, and secure U.S. interests in Asia.
Step-by-step explanation:
President Theodore Roosevelt sent the Great White Fleet on a worldwide tour for a combination of reasons. One motivation was to demonstrate American naval power and assert the United States as a global superpower. The fleet's voyage was also intended to serve as a show of force towards Japan after it forced American business interests out of Manchuria.
Additionally, the tour was portrayed as a goodwill mission, which helped to reinforce the Open Door policy in Asia and secure U.S. interests in the region.