Cuba. Here is evidence: "U.S. victory in the war produced a peace treaty that compelled the Spanish to relinquish claims on Cuba, and to cede sovereignty over Guam, Puerto Rico, and the Philippines to the United States. The United States also annexed the independent state of Hawaii during the conflict."
Source: https://history.state.gov/milestones/1866-1898/spanish-american-war
The events that turned the tides would be when Germany made enemy's with the soviet union, America entering the war and the events of D-day.
plz thank or brainlyst