What countries were a part of the Washington peace conference?

The Washington Peace Conference, held in 1898, primarily involved the United States and Spain, as it aimed to negotiate the terms of peace following the Spanish-American War. The conference resulted in the Treaty of Paris, which ended the conflict and led to Spain ceding territories such as Puerto Rico, Guam, and the Philippines to the United States. While the focus was on these two nations, the conference also had implications for Cuba, which was granted independence.