No FDR ammendment to the Neutrality Act 1935

What if FDR was unable to convince the congress to ammend the Neutrality Act of 1935 so that it favoured 'belligerents' such as Britain? How would this have played out in terms of US involvment in WW2?
 
I think that he would make his best so that, in case of war, the companies that made military gear sold as much as possible to Britain and France. Of course, the Act goes to the rubbish bin in December 7th 1941...
 
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