In 1967 and 1968, Senator William Fulbright held public hearings on the war.
No.
It ended officially with the Paris Peace Accords negotiated by Henry Kissenger and ratified by the U.S. Congress.
The Vietnam War officially began on November 1, 1955.
At the end of the Vietnam War, Congress refused to support South Vietnam any longer.
All were officially neutral.
Officially, no
Very good question! War is defined as a state of hostility, conflict, or antagonism, as well as a state of usually open and declared armed hostile conflict between two states or nations. Technically, for the United States at least, a war is not considered a war unless it has been declared by congress. Hence, why we refer to the war in Vietnam as the "Vietnam Conflict". But regardless of congress officially declaring so or not, war is war.
war
At the end of the Vietnam War, Congress refused to support South Vietnam any longer.
Laos was officially neutral.
Officially not used.