Where was the text of the UN Charter was finalized?

The main allies of the World War II are also known as Big Three. The big three included the Soviet Union, the United States, and the United Kingdom. The First world war II conference between these Big Three was the Tehran Conference that was held from November 28 to December 1, 1943. It was codenamed Eureka. After this conference, the Yalta Conference followed on February 4 to 11, 1945 at Yalta in Crimea. So it was known as Crimea Conference and was codenamed the Argonaut Conference. The participants of these conference were Winston Churchill, Franklin D. Roosevelt and Joseph Stalin. It was this conference in which the reorganization of Europe after the war was to be decided. Germany was made to accept that it would undergo demilitarization and denazification. In the Yalta Conference, it was also decided that fight against the Empire of Japan to be concluded within 90 days after the defeat of Germany. The important conference after the Yalta Conference was the Potsdam Conference, which was held from July to August 1945. In this conference, Clement Attlee was there as PM in waiting and as soon as the Labour Party’s got victory over the Conservatives, Atlee had replaced Churchill as Prime Minister of England. From US side, it was President Henry S Truman to participate in the conference. The major outcome of this conference was the “”Potsdam Declaration”” which asked Japan to Surrender. It is said that Truman was not aware of the bombs prior to death of Roosevelt. President Truman ordered the dropping of an atomic bomb on Hiroshima on August 6, 1945. It was the Dumbarton Oaks Conference, where United Nations was formulated and negotiated among international leaders. It was held from August 21, 1944 through October 7, 1944 at Washington DC and in this conference the text of the UN Charter was finalized.