The biggest disagreement among the Big Three at Potsdam was over territorial claims. The Soviet Union wanted to annex large parts of Poland, Romania, and Czechoslovakia, while the United States and Britain were more moderate in their demands.
Demilitarization of Germany
The Allies also disagreed about how to demilitarize Germany. The Soviet Union wanted to completely dismantle Germany's military and industrial base, while the United States and Britain wanted to allow Germany to retain some military capability for self-defense.
Democratization of Germany
The Allies also disagreed about how to democratize Germany. The Soviet Union wanted to impose a communist government on Germany, while the United States and Britain wanted to allow Germany to develop its own democratic government.