The US had 2-3 years of supplying the British before they became embroiled in the war themselves. Plenty of time to ramp up production of the comparatively primitive designs of the time. Even compared against the contemporary German designs, the Sherman for example was barely adequate and basic.
It would be interesting to see how they may have faired if they'd had a cold start and were trying to produce complex machines such as the Tiger or Panther. Probably better than Germany did, but definitely not as well as IRL.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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