I can think of a lot of different ways for the United States to commit national suicide, but none faster than remaining as a member of the United Nations.
On top of that, our leader in the White House is all for it; if he thought he could somehow get away with it, he would just signal his sub-rosa (they think) leaders, Soros and the Bilderberg Group of maniacally wealthy would-be despots who want to own the world and they would come marching in.