The French and Indian War was the longest US war before 1850.The longest US war in history was the Vietnam War.
The longest war the United States ever entered was the Vietnam War.
Viet Nam 1961-1975
The US has been fighting in Afghanistan longer it was fighting in Vietnam. It is the longest war in US history.
Vietnam
In the 18th, 19th, and 20th centuries, it was the Vietnam War.
The U.S. declared War on Terrorists.
it is said to be the Vietnam war although the war against the middle east is still ongoing
The Phabulous F-4 Phantom wins it hands down !
The siege of Petersburg lasted nine months.
America's longest war was against the American Indians (American Natives) which lasted from 1622 (Battle of the James River Settlement which had 347 colonists killed) to the Battle of Wounded Knee in 1890. America's longest war against another COUNTRY (Nation) was the Vietnam War. A war against the country of North Vietnam. America's longest war and bloodiest war would be the Vietnam War with over 58,000 US military men being killed there. America's bloodiest war would be the American Civil War (US Civil War) with nearly a million dead, but Americans were killing Americans...thus the high number.
Against another "NATION" (Country) yes. America's longest war was the "Indian Wars" which lasted from 1622 (James River Settlements) to 1890 (Battle of Wounded Knee).