The correct answer is: 3 trillion dollars
They produced different materials and crops.
Upon taking office, Nixon was obsessed with the idea of winning the Vietnam War. Despite the national protests against increased US involvement in Vietnam, Nixon said that a majority of Americans supported his actions. This term becomes known as the silent majority.
In the beginning, Nixon orders several different means of attacks. This includes the use of Agent Orange, a highly dangerous chemical meant to destroy the Vietcong supplies, and the Christmas Day Bombings in 1972. Despite his best efforts, the US was not going to have success in Vietnam.
This resulted in Nixon developing a new policy of Vietnamization. The goal of this policy was for the US to train the Southern Vietnamese army to handle the fighting on their own. This plan also called for the gradual withdrawal of thousands of American troops.