Answer:
Even after signing the Paris Peace Accords, South Vietnam remained in the fight with North. South Vietnamese President Nguyen Van Thieu publicly stated that the agreement was no longer in effect. With the withdraw of the remaining American troops, South Vietnam was left alone without any military and economic aid. South Vietnam army was left out with less arm and ammunition, among other supplies which led in the thinning of troops by not providing sufficient help resulted in diseases and death. Ultimately, South Vietnam surrendered to North Vietnam in 1975.