Answer- The D-Day invasions
Reasoning-
The fall of Berlin happened AFTER WW2 in 1989.
The Battle of Stalingrad was inbetween the Soviet Union and Germany when Germany tried to take over the Soviet Union but failed.
The Battle of Liberation was placed in France when Germany successfully took over Paris and the french had decided to fight back.
All three of them had nothing to do with the American troops.
D-Day though was created with the help of the british by the Americans to storm the beaches Normandy as a sneak attack to throw off the Nazi’s that were occupied in France.