Regarding the unity it created: took a while, but we got there. One interesting fact about that war: it was 20 years long and resulted in (so far) ~ten times more American deaths than the War on Terror (Iraq and Afghanistan combined).
My observation, FWIW...People today don't often recognize just how huge the anti-war movement was. I don't know how to include the Hippie movement in that other than to say it at least showed that people of all ages and walks of life were were actively against the war.
None of this amounts to a real "measurement" such that I could debate the point, just interesting facts. Another one: by far the deadliest war in US history was the civil war, during which 1 in 50 US citizens died (including North and South).
Compare that to today, and look at your FB friends list. If you have 400 friends, odds are at least 8 of them would be dead after the war. (but probably more, considering the FB demographic is probably younger and thus more likely to be soldiers)
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