I thought that was the League of Nations created in S.F. which failed miserably.....even though the U.N. is of the same ilk, I don't think the U.N. was created in S.F.
LOA was created in Europe Pres. Wilson kept sailing back and forth then the Senate wisely decided to stay out of it. The U.N. as charter was signed in SinFreakSicko.
Sadly, the UN Charter was signed at the Fairmont. That's why there are all those flags in front of the hotel. There is a UN Charter room there but I haven't seen it.