I read Victor Davis Hanson’s latest WW2 book, and was amazed when I read the US produced 90% of all aviation fuel used in the entire war.
Anybody declaring war on the US, Soviet Union and the British nearly simultaneously must have been a damned fool. And he was.
I have always maintained that the stupidest move of the war was Hitler declaring war on the US.
There was a really good chance that the US would have ignored Europe and concentrated on beating Japan to a bloody pulp. Which would not have been easy. We would have hit the main islands of Japan before the Atomic Bombs would have been ready and it would have been a meat grinder. We would have won but we would have taken horrendous losses.
By that time the Nazi's would have had time to take the UK. We would no longer be sending them supplies because we needed them for our own war.
And no, there was no pact that said Germany had to declare war on us. You might notice that Japan never declared war on the USSR.