Tehran Conference

The Tehran Conference, also known as Eureka, was the meeting of the three greatest minds in the nations to put their heads together and think of a way to overpower Germany. Winston Churchill, of the United Kingdom, Joseph Stalin, of the Soviet Union, and Franklin Roosevelt, of the United States, met up in Tehran, Iraq, between November 28 and December 1,1943, to discuss ideas for a solution. The main aim of the Tehran Conference was to strategize the final plan for the war against Nazi Germany and its allies. The first objective was to get full cooperation of and assistance from the Soviet Union, which was obtained, but for a price. Stalin convinced the allies to support partisans in Yugoslavia and also insisted on new borders between Poland and the USSR. Once Churchill and Roosevelt had Stalin on their side, they came up with Operation Overlord. Operation Overlord, which was later known as D-Day, was scheduled to start on May 1944, in union with an operation against southern France. They requested cooperation from other countries that were against Germany to help them with Operation Overlord. The Great Three also decided to keep in contact and to stick together in this war against Germany and it’s allies. Since Japan was one of Germanys’ allies, the Soviet Union agreed to wage war on Japan after Germany had been defeated. Ideas, which were thought of at the Tehran Conference, caused the turning point in WWII.    
Declaration of the Three Powers had been signed by the Big Three. I starts as following:
"We the President of the United States, the Prime Minister of Great Britain, and the Premier of the Soviet Union, have met these four days past, in this, the Capital of our Ally, Iran, and have shaped and confirmed our common policy. We express our determination that our nations shall work together in war and in the peace that will follow."

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Video: Opening of Tehran Conference,Nov 28, 1943 (by Ancestry).