Rich men could get draft deferments.
Because students were exempt from military service - a serious blunder that killed-off any idea of the educated class as national leaders.
Because university students were exempt from service.
If you weren't rich, or related to a politician, or if you weren't a college student...then you were, quite possibly, headed for Vietnam.
Because it caused a lot of dead, protests, riots, arguments, and headaches for a very long time.
Yes. If you're looking for that word "declared" war then there hasn't been a legal war since WWII. If any war's weren't legal, it was the American Revolutionary War (we'll all hang together...Ben...
Men of War: Vietnam Trailer
Vietnam War: History and Key Dates
How the Vietnam War Shaped Richard Armitage
Counterinsurgency During the Vietnam War