What four agreements did the big three make at Tehran?

At the Tehran Conference in 1943, the Big Three—Franklin D. Roosevelt, Winston Churchill, and Joseph Stalin—made four key agreements. They committed to the opening of a second front in Europe to alleviate pressure on the Soviet Union, agreed to pursue the unconditional surrender of Nazi Germany, discussed post-war plans for Europe and the establishment of the United Nations, and coordinated military strategies to defeat Axis powers. These agreements set the stage for Allied cooperation and future post-war reconstruction efforts.