The treaty that concluded the Spanish-American War in 1898 is the Treaty of Paris. Signed on December 10, 1898, the treaty marked the end of hostilities between Spain and the United States following the brief conflict triggered by the explosion of the USS Maine in Havana Harbor. Under the terms of the treaty, Spain ceded Puerto Rico, Guam, and the Philippines to the United States and relinquished its claim to Cuba. This significant shift in territorial control signaled the emergence of the U.S. as a global power and set the stage for its imperial expansion in the early 20th century.