Which of the following caused vietnam war? ? a japan attacked south vietnam b north vietnam wanted all of vietnam to be communist (i think its this) c south vietnam wanted to remain communist d the soviet union attacked the south vietnam

North Vietnam wanted all of Vietnam to be communist

Option B

Explanation:

Vietnam war started because the northern part of Vietnam which was supported by the USSR and by China also wanted the whole country to be under communism only. Where as the United States wanted to prevent the spread of the communism in the whole world which was spreading at a very fast rate. Because of the difference in these two ideologies, it led to the war in Vietnam named as Vietnam war. South Korea was also in favor of preventing the spread of communism in different countries.