Which U.S. president took part in the Potsdam Conference, where the Allies reached a peace settlement with Germany?

The answer is Harry S. Truman. He took part in the Potsdam Conference where the Allies reached a peace settlement with Germany because he had become the President of the United States following the death of Franklin D. Roosevelt, who had attended earlier conferences such as the Yalta Conference but did not live long enough to participate in Potsdam. As the newly appointed President, Truman represented the United States and worked alongside other Allied leaders to establish the terms of peace and decide on the post-war administration of Germany.