What are two undeclared wars?

Two notable undeclared wars are the Vietnam War and the Korean War. Both conflicts involved significant U.S. military engagement without formal declarations of war by Congress. The Vietnam War spanned from the late 1950s to 1975, while the Korean War lasted from 1950 to 1953, resulting in long-lasting impacts on U.S. foreign policy and military strategy. These wars highlight the complexities of military intervention in the absence of formal declarations.