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The USA was largely unsuccessful against the Vietcong and their backers the northern communist forces mainly because of the terrain of south Vietnam and the general popularity of the Vietcong among common Vietnamese.
DukeMoseti
The United States failed to score a quick victory against the Vietcong mainly because of the Vietcongs fighting style and Vietcongs refusal to surrender. This particularly made ground incursions difficult as the U.S forces were met with strong opposition.