What two national leaders were present at the Yalta Conference but not at the conclusion of the Potsdam Conference?

Question

Quizplus · Accepted Answer

Churchill and Roosevelt were present at the Yalta Conference in February 1945, but by the time of the Potsdam Conference in July-August 1945, Roosevelt had died and was succeeded by Truman, and Churchill had been replaced by Clement Attlee after losing the 1945 British general election.

What Two National Leaders Were Present at the Yalta Conference