The text of the "Declaration by United Nations" was drafted by U.S. President Franklin D. Roosevelt, British Prime Minister Winston Churchill, and Roosevelt aide Harry Hopkins, while meeting at the White House on 29 December 1941. It incorporated Soviet suggestions, but left no role for France. The first official use of the term "United Nations" was on 1–2 January 1942 when 26 governments signed the Declaration. One major change from the Atlantic Charter was the addition of a provision for religious freedom, which Stalin approved after Roosevelt insisted. By early 1945 it had been signed by 21 more states.

Source: WIKIPEDIA