The Quasi-War, which at the time was also known as “The Undeclared War with France,” the “Pirate Wars,” and the “Half War,” was an undeclared naval war between the United States and France. The conflict lasted between 1798 and 1800, and was a formative moment for the United States.

Was Vietnam an undeclared war?

The United States did not declare war during its involvement in Vietnam, although the Gulf of Tonkin Resolution authorized the escalation and use of military force in the Vietnam War without a formal declaration of war.

Who won the undeclared war?

Treaty of Mortefontaine Brings Peace with France The President dispatched official envoys to France. On September 30, 1800, the Treaty of Mortefontaine was signed, ending the hostilities of the undeclared war. The Treaty terminated all previous agreements and reestablished trade ties between the two nations.