Reasons for the end of World War II

G2 Full History - syllabus K227, 2027

Why did Germany and Japan lose the Second World War? Allied supplies and strategy, and the pressures behind Japan's surrender in 1945.

• How American strength kept the Allies going

  American factories made the weapons, trucks, fuel and ships the Allies needed, and Lend-Lease got them there even before the USA joined the war.

• Winning the Atlantic kept supplies moving

  Codebreaking, escorts and aircraft beat the U-boats by May 1943, so American troops and supplies could cross to Britain and Europe.

• Why Germany lost in the East

  The USSR kept fighting after huge losses and struck back, while Hitler's rigid orders made German defeats worse.

• How D-Day squeezed Germany

  D-Day opened a major front in the west while Soviet armies pushed from the east, so Germany had to split forces it could not replace.

• Island hopping in the Pacific

  The Allies captured key islands to use as bases and skipped others, leaving Japanese garrisons cut off.

• Why Japan's empire could not supply it

  Japan conquered lands rich in oil and food, but Allied submarines sank the ships that carried them, so shortages grew.

• Why Japan surrendered in 1945

  Japan was already badly weakened; the atomic bombs and the Soviet declaration of war in August 1945 pushed its leaders to surrender.

• Put it together: Match a cause to the outcome

  Germany's defeat, Japan's weakening and Japan's surrender decision are related but different outcomes.