I truly don’t know the answer but I go on safari and look it up LOL
Answer:
Land was flat close to the coastline but became hilly and mountainous farther inland. Soil was generally rocky, making farming difficult. Cold winters reduced the spread of disease.
Explanation:
Because they were fighting on their own territory and defending their home, the vietcong had greater determination than the US who were not really sure what they were there for.