Technically speaking, US support Thai regime while Thai physically supported Khmer Rouge Regime, they may be pro-US but US have nothing to do with it, get your fact right first.
Technically speaking, you are just shameless liar. If not, you can just google "USA support khmer rouge" and find truth.
http://msuweb.montclair.edu/~furrg/pol/polpotmontclarion0498.html
Didn't I hear somewhere you're going for a master degree?
A comment from one of my friends : smartest US students go to business school, medical school for money, less smart students find a job after college, those who can not get a job go to graduate school. That's probably true.