(A) ** declaring war on Spain
(B) Roosevelt Corollary
(C) yellow journalism
(D) Monroe Doctine
EXPLANATIONS BELOW
Concept note-1: -On April 25, 1898 the United States declared war on Spain following the sinking of the Battleship Maine in Havana harbor on February 15, 1898. The war ended with the signing of the Treaty of Paris on December 10, 1898.
Concept note-2: -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.
Concept note-3: -Spain declared war on the United States on April 24, followed by a U.S. declaration of war on the 25th, which was made retroactive to April 21.
Concept note-4: -On April 25, 1898, Congress approved a resolution declaring war with Spain.