There is a lot of propaganda about this issue.

In what he thought was a private conversation with a friend in 1963, Zhukov said.

"People say that the allies didn't help us. But it cannot be denied that the Americans sent us materiel without which we could not have formed our reserves or continued the war. The Americans provided vital explosives and gunpowder. And how much steel! Could we really have set up the production of our tanks without American steel? And now they are saying that we had plenty of everything on our own."

Without the joint efforts of all the allies, WW2 goes much worse.