Also, I find it odd why some of you from the USA are against the EU
This is something I really cannot understand. The EU has done a lot of good for all of its 28 (now 27) member countries since it formed ~40-50 years ago. Yes, it obviously has some problems but so does every country or union including the USA. I feel that no country is worse economically than they were before they joined the EU and overall the EU has helped its members to develop both politically and economically.
Furthermore, there is a reason the votes were very close to a tie, because remaining in the EU brings many benefits that the UK or any other country cannot deny.