How did the war change under President Nixon's administration? underline his new policy

Vietnamization was the policy to end the U.S. involvement in the Vietnam war.

Explanation:

War changed because the new policy made it where the U.S. troops involvement was going to end, and they were no longer going to partake in the Vietnam War

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.