There would not have been a WW II. There would have been a War in the Pacific between Japan and China which would have ended with a larger Japanese empire that included China and South East Asia. Japan would not have “executed the winds” if they didn’t have Germany to declare war on the US.
Yes there would have.
Had Germany won WWI, they would still not have been able to crush England.
They would have conquered France, concluded peace with England and then waited until the moment was right to go after England again.