Atomic Bomb and the end of WW2

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Across
  1. 2. Fired a nuclear missile at the US
  2. 3. Invaded Germany from the West
  3. 5. The leader of Germany in WW2
  4. 6. Was going to lose World War 2
Down
  1. 1. Most powerful nation in the world
  2. 4. Ended the war in the Pacific