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The United States. The US not only funded their own part in the war but they lent money to Britain to fight the war. They also provided aid to displaced persons and liberated Jews during and after the war. The atomic bombs were the most expensive bombs to build, transport and fly to their destinations. They cost over 2 billion dollars, closer to 3 when add in peripheral costs. The US also had to pay interest on the billions of dollars of war bonds too.

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14y ago

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