The correct answer is D) the Philippines.
After the conclusion of the Spanish-American War, the United States faced stiff opposition—in the form of guerrilla war—from the Philippines.
The Philippine American War started on February 4, 1899, and ended on July 2, 1902. The First Philippine Republic totally opposed to the resolution of the Treaty Paris that gave the United States possession of the Philippines as part of the agreements after the US victory in the Spanish-American War. Years of permanent conflict happened until the Philippines gained independence after World War II, in 1946, with the Treaty of Manila.
