How did the us lend-lease program of 1939 the allies?

This really helped out the allied powers. Since they were getting supplies they would be able to sustain the war/stall the war in time. During German's operation barborssa they had took advantage of this. All of the supplies sent by the US and other countries were mounted up, and US soldiers were sent to Britian. Commonwealth soldiers were also supplied because of this reason.

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