In what way did the United States fail to keep the promise to Spain

The United States failed to keep its promise to Spain when it annexed the former Spanish colonies of Puerto Rico, Guam, and the Philippines after the Spanish-American War. The US had promised to respect the sovereignty of Spain over its colonies, but instead annexed them and made them US territories. This annexation was a violation of the 1898 Treaty of Paris, which ended the war and stipulated that Spain would retain sovereignty over its colonies.