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How to change the tech development so that in World War 2, there will be:
1. Standard/widespread use of assault rifle instead of bolt-action and SMG weapons
2. Standard/widespread use of light/heavy tanks from the start of the war (blitKrieg time using heavy tanks for example)
3. Supersonic flight or rocketry for at least at 1941
4. Suborbital flight by 1945
5. BONUS: freight and transport dirigibles/zeppelins trhoughout the war