Defining a war in the traditional method, which the conflict was fought against another "COUNTRY" (nation) which had a set government and a national flag, the Vietnam War would be the longest (war against the nation of North Vietnam). Defining war in the broad sense, and not neccessarily fought against a country with a set government and a national flag, then the American Indian Wars (American Frontier Wars) would be America's longest war(s): roughly 1620 until 1890 (ending at the Battle of Wounded Knee).
The French and Indian War was the longest US war before 1850.The longest US war in history was the Vietnam War.
The war on drugs
The longest war the United States ever entered was the Vietnam War.
yes the US did fight in ww1 it was closer to the end of the war though
Viet Nam 1961-1975
NO. He was President of the US during this war, but did not fight in it. (He did fight in the Civil War. )
The US has been fighting in Afghanistan longer it was fighting in Vietnam. It is the longest war in US history.
Vietnam
Korean War.
Korea
The Civil war of 1864
The US did not fight in the Spanish Civil War although at least 2,000 US citizens did serve in the International Brigadesagainst the Fascists.