Wrong again. The United States invaded Vietnam for the sole purpose of helping France. It lied to its people and said it was to stop the Domino Effect (if one country falls to communism, they'll all fall like dominos). Yet, today, many members in office during the time claim they were wrong for entering Vietnam. They also express how the domino theory was wrong. I realize the following quote won't mean much since I do not remember who said it, so you probably won't believe me on it...but, here goes: "When a person is wrong, they are man enough to apologize and recognize they are wrong. What I don't understand is that when a government is wrong [as it was in Vietnam], why can't it do the same thing? I realize now that I was wrong. I was wrong about the war, and I was wrong about the Domino effect." - This quote belongs either to a senator at the time or to a cabinet member. I cannot remember which, nor the name of the person. But I distinctly remember the quote as I really liked it.
Many people are also using this Domino theory to make comparisons between Iraq and Vietnam.
The Reverse Domino Theory. Furthermore, when a majority of the people in vietnam (see earlier in this thread for more information) would rather be communist and independent, why would America go in and force them to set up a democracy instead? Not only did they do that, they also cost the Vietnamese over 2.5 million lives.