What countries practiced imperialism during the Spanish American war?

During the Spanish-American War, the primary countries involved in Imperialism were the United States and Spain. The U.S. sought to expand its influence and territories, leading to the acquisition of Puerto Rico, Guam, and the Philippines after defeating Spain. Spain, on the other hand, was attempting to maintain its colonial possessions in the Americas and the Pacific, but ultimately lost its last significant colonies as a result of the war.