That's a long story. The bottom line is the creation of war to keep "the masses" under control. Yeah, I know Kissingers remarks. I know all about ALL of it.
The important question is WHO is doing it. Read Bill Hughes works, that'll give you the CEO's of the evil empire. Watch Zietgeist for all the various organizations they use to control the world.
Vietnam??? Contrived right from the start. The Gulf of Tonkin incident never happened. The British were supplying the north with all the supplies needed to fight the south through the port of Haipong. ("British Israel" at educate-yourself.org) The drug trade out of Laos was totally CIA. The bottom line was religion. The Catholics wanted a foothold in the Far East. That's why the extermination of the Bhudists. Didn't hear much about that though did you???
Other than that it was typical Industrial military complex that Eisenhower warned against and that Kennedy was dismantalling by getting rid of the CIA. The movie "JFK" is a true story taken right out of L. Fletcher Prouty's book "Vietnam, The CIA and the Assassination of JFK". Prouty's the guy Costner went and saw in Washington. Head of "Black ops" of the CIA from 1945.
Vietnam??? Yeah, nasty, nasty war. Ruined almost 34 years of my life. And the guys coming back from the Middle East right now are in a lot worse shape then we were and aren't living much beyond 5 years or so. Lots of suicides and homelessnes. Nasty chemicals and depleted uranium (DU) poisoning.
All the wars going on right now on the planet are contrived. All of them. The ONLY reasom for war is to free ourselves of the "elites" that are doing all the dastardly deeds to us. And the last time we did that was our own revolution.
Our Constitution IS the enemy. Freedom IS the enemy. Keep on studying, there's a lot to learn. I could go into great length about it.