Why did the Allies win WWII?

Battle of North Atlantic (1940-1943, Allies win)
Air:

• Air cover for convoys
• Planes could sink submarines
• "Huff Duff"

Sea:

• Use of convoys
• Breaking the "Enigma" code
  

El Alamein/Operation Torch (1942, Allies win)
Air:

• British air bases in Egypt and Palestine
• Sank German supply ships
  

Land:

• Tank warfare
• Helped set up invasion of Italy
• Saved Middle East oil from Germans
  

Sea:

• Saved Suez Canal from Germans

Battle of Stalingrad (1942, Allies win)
Air:

• German effort to supply by air fails
  

Land:

• Very close house-to-house, room-to-room fighting
• Tank battle (USSR tanks encrcle the Germans)
  

Battle of the Coral Sea/Midway/Guadalcanal (1942, Allies win)
Air:

• Use of aircraft carriers
  

Land:

• Fighting took place on the islands
  

Sea:

• US breaks Japanese secret codes
• Allies fought to take back Pacific islands