Why Is The Vietnam War Significant To U.S. History?

It was the first war that the US was involved in that the US was defeated. It was the first war that was a "Media War" and a "TV War" and the sights at the dinner table in the evening were disturbing to ordinary Americans. The US learned from this and that is why there is extreme censorship by the US military of their operations today. It was the first war that divided the US people about the war, and also divided the media who initially were pro-war, but later became largely anti-war.