Lend Lease was a significant contribution to the Soviets and the number one item that contributed to their victories was the deuce and half truck. Once received in great numbers, it gave them optimum mobility allowing their infantry to keep up with the tanks. The Germans at this stage were limited to foot and horses. Without these trucks, the Germans would have had time allotted to perform short withdrawals and saved many more men from the gulags.

Second part, initially not change but it would depend on if Hitler would have repeated his mistake and declared war on the U.S. If so, I think the U.S. would have put the Pacific as a higher priority and the war in Europe would have not ended in 45 but perhaps in 47. This is assuming there was no lend lease. I believe Churchhill was the Soviet's advocate on this. My 2 cents worth

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American by birth, TEXAN by the grace of GOD!