WWII Invasion – without the US ?

In another thread I have come across a couple of posters who believe that a successful invasion of Europe could have been achieved without the United States of America.

I think that this absolute tosh.

Without help from the US in my opinion the allies would probably have lost the war.

Amongst other things I doubt we would have been stong enough economically to continue with the fight during the early 1940’s without American economic assistance let alone militerily. The UK owes a huge debt of gratitude to the US and Presdident Rosevelt in particular.

OK, I appreciate that Hollywood would have it that the US won the war by itself. Rubbish of course. However wthout the US we would now be speaking either German or Russian.