When established united nations organization to whom?

Question

1940, 1942, 1945.

Answer 1

The more direct route if you read English:

http://www.un.org/aboutun/unhistory/

Answer 2

Please PLEASE tell me that English is not your first language!!

Some hints about your question:

The Second World War ended in 1945.

A similar effort to the United Nations called the League of Nations was established at the end of the First World War.

Answer 3

You can find out when the UN was established and when each member nation joined by going to this site...

http://www.un.org/

They also have information in your own language.