North America (US); the Indian Wars, from approximately 1620 (when the Pilgrams landed) until the Battle of Wounded Knee in 1890.
Before America became a country, we fought in the French and Indian War. But, the first war we fought as a country was the American Revolutionary War.
It was not a specific country more like a region but the war was the Gulf War.
The first Iraq War was fought to drive Iraq out of Kuwait. - And BTW - a few Allies helped. It was not entirely a "US war"
Spain and the US fought the War, but not on their home turf.
Italy
Vietnam
Before America became a country, we fought in the French and Indian War. But, the first war we fought as a country was the American Revolutionary War.
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).
China
Albania.
France
It was not a specific country more like a region but the war was the Gulf War.
The Phabulous F-4 Phantom wins it hands down !
the Philippinesthe Philippines
The first Iraq War was fought to drive Iraq out of Kuwait. - And BTW - a few Allies helped. It was not entirely a "US war"
We fought the British from England.
The French and Indian War was the longest US war before 1850.The longest US war in history was the Vietnam War.