If Britain received the entire US Navy

What if the neutral United States lend-leased its entire navy to Britain?

Britain would gain overwhelming strength in the Atlantic and Mediterranean and could shift American carriers toward the Far East, though crews and political compensation would be decisive details.

The first distinction is between lending ships and lending their trained crews, because an entire fleet without its personnel is a very different asset. With crews included, Britain could reinforce Cunningham in the Mediterranean. American carriers could move toward the Atlantic, Indian Ocean, and Pacific. Japan would then face a much larger Allied force before entering the war.