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 Conflict. In the Vietnam War â which lasted from the mid-1950s until 1975 â the United States and the southern-based Republic of Vietnam (RVN) opposed the southern-based revolutionary movement known as the Viet Cong and its sponsor, the Communist Democratic Republic of Vietnam (the DRV, or North Vietnam).