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.
Role of the United States in the Vietnam War. The role of the United States in the Vietnam War began after World War II and escalated into full commitment during what is termed the Vietnam War from 1955 to 1975.