Final answer:
American soldiers used Agent Orange during the Vietnam War to defoliate trees and plants in order to make it harder for the Vietcong to hide. This herbicide-defoliant was sprayed over large areas, especially near the Mekong River delta.
Step-by-step explanation:
Agent Orange was used by American soldiers during the Vietnam War for the purpose of defoliating trees and plants. This herbicide-defoliant was aerially sprayed over large areas, particularly near the Mekong River delta, to make it harder for the Vietcong to hide from spotters in the air. The United States sprayed nearly 4.5 million acres of Vietnam with herbicides and defoliants between 1961 and 1971.