This strain of thinking is typical after a war, as it shifts the blame to internal dissenters who think the war itself is a bad idea. It was employed by the Nazis after the World War I to convince the German people that Germany had not been military defeated but betrayed in 1918. It's an ongoing them among those who wish to see Vietnam as having had a purpose.
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Background Information
The dividing line between the powers of the federal government, designated by the Constitution, and those reserved for the states has long been controversial.