The Ozone layer, which mostly lies on the lower portion of the stratosphere.
How Long Did The Vietnam War Last. The Vietnam War is the longest war ever to have taken place in the American history. It lasted for 16 years and it was terrible for the Americans at that time as the Civil Rights campaign was at its peak and so also the Vietnam War and anti war protests.
The Vietnam war was the longest war American had fought in. We got involved with the war in 1954 and it ended in 1973. 58,000 Americans were killed in the war and 2-3 million Vietnamese were killed as well. 7 people found this useful.