In my opinion there is two main points that allowed the Allies to win the war in the European theater. The first one is when the Russians were able to stall the Germans at Stalingrad. If the Russians would have lost Stalingrad Germany would've had little resistance on their march to Moscow. The second happened when Allied forces were able to halt the last major offensive of the Germans in the Ardennes Mountains of Belgium all so known as the Battle of the Bulge.
It was the Battle of Brtain
Pearl Harbor
Radar
Allies
The Allied landings of D-Day were the most decisive strategic event in turning the tide in favour of the Allies.
The invention of the tanks and the coming of the US reinforcements.
The Battle of the Plain of Abraham.
The tide turned in favor of the United States during the battle of midway
Radar
Allies
Second Battle of El Alamein turned the tide of the war in North Africa for the Allies. It was the first Allied Victory in two years and proved British commander Field Marshal Montgomery's reputation.
Midway Island
Battle of Midway
I think it was the Battle of Midway.
saratogu
the Battle of Saratoga!
Gettysburg
Gettysburg
The Allied landings of D-Day were the most decisive strategic event in turning the tide in favour of the Allies.