The Afghan war was the longest in American history with constant conflict.
The Third Punic War is-technically-the longest war in human history,lasting 2134 years.
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The question was not about American history, but human history.
It is nonsense to talk of the Carthaginians being 'technically' still at war today, when they were sold off into slavery at the end of the Third Punic War in 146 BCE and ceased to exist as a city, country or people.
We do have The Hundred Years War 1337 to 1453 CE between England and France. In earlier times we had the Persian Wars 499-449 BCE.
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Asia and Africa.
The deadliest war in man's history was WW2, conservatively 40,000,000 casualties.See the list in the site War etc Casualties in the separate window Sources and Related Links below.
The longest war against another recognized government was the Vietnam War which took place from 1955 (President Eisenhower's administration) through 1975 (President Ford's administration).
Desert Storm was about a 45 day military campaign. Operation Iraqi Freedom and Operation Enduring Freedom (Afghanistan) has outlasted DS by years! Longest war in European history might be the 100 year war. Then they have a couple of 30 year wars too. Most "traditional" (normal) wars in the 19th & 20th centuries lasted 3 to 5 years.
Eastport Tug o' War Boley tug of war from Ireland was in the longest pull.