The option that is NOT one of the major events associated with the Spanish-American War is the setting-up of a base at Guantanamo Bay, because that event happened after the Spanish-American War (that lasted from April 25, 1898, until August 12, 1898), so, that event is not one of the major events associated directly with the War said before.
But due to that U.S defeated Spain in the Spanish-American War in 1898, thorough the Paris Treaty of December 10 1898 the U.S obtained Guam, Puerto Rico and the Philippines from the Spanish, and was accorded the later Independence to Cuba. Therefore, time later the U.S.A in the Cuban-American Treaty asked to the new president of the newly independent Cuba for a perpetual lease of the Guantanamo Bay to establish a naval station there, which then was approved and began on February 23, 1903.
