The United States involved itself in Vietnam in the 1960s because

Responses
A the American people demanded the government support Vietnam.the American people demanded the government support Vietnam.
B American businesses in Vietnam were threatened by the Communists.American businesses in Vietnam were threatened by the Communists.
C it feared that if Vietnam became communist then surrounding countries would quickly follow.it feared that if Vietnam became communist then surrounding countries would quickly follow.
D Japan was threatened militarily by the possibility of a Communist government in Vietnam.

C it feared that if Vietnam became communist then surrounding countries would quickly follow.