Who:The Vietnam war was between the U.S.A., Vietnam, South Vietnam, Australia, South Korea, New Zealand.
What:The Vietnam war was a struggle between the U.S. Forces attempting to unify the country of Vietnam of the communists government of the United States preventing to spread comunisum.
Why: It happened because north Vietnam was trying to spread comunisum to south Vietnam.
When: in 1959-1975 the Vietnam war began and north Vietnam invaded different countries in Vietnam.