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.
Digital History. The Vietnam War was the longest war in American history and the most unpopular American war of the 20th century. It resulted in nearly 60,000 American deaths and an estimated 2 million Vietnamese deaths. It was the first war to come into American living rooms nightly, and the only conflict that ended in defeat for American arms.