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 officially ended in April 1975 during the Fall of Saigon. The United States withdrew in 1973, therefore leaving the South Vietnamese Army to defend the countryâ¦ by themselves. North Vietnam had agreed to a cease fire in 1973, and the US had to withdraw under the agreement.