The correct answer to this open question is the following.
The effect the local topography had on the wars. The ways in which the Vietnamese adapted their fighting strategies to the physical geography of the region were determined in the result of the war. The terrain of the Vietnam Cong resulted in a key aspect that favored the war tactics against US troops. Geographical features were very complicated for the American troops to operate with success.
We are talking about the regions of the Red River Delta, the Mekong Delta, the Northern Highlands, the Coastal Lowlands, and the Annamite Mountain Range.
The Vietnamese troops knew the territory like the palm of their hand, and this gave them a huge advantage.
