The document provides background on the Spanish-American War between Spain, Cuba, and the United States in the late 1890s. Spain was fighting Cuban rebels seeking independence and instituted harsh policies like concentration camps that killed thousands from starvation and disease. This turned American public opinion against Spain as the US had economic interests in Cuba. "Yellow journalism" in American newspapers further inflamed public opinion. When the USS Maine exploded in Havana harbor, most Americans blamed Spain and war was declared in 1898. The US defeated Spain at battles like Manila Bay and San Juan Hill with Teddy Roosevelt and his "Rough Riders". As a result, the US gained control of Cuba, Puerto Rico, Guam, and the Philippines and became a global power