It was Churchill who used every trick in the book to draw the US into WW II—and some historians believe (and I am convinced) that the British had broken the entire Japanese code before Pearl Harbor and kept the missing pieces from the US to make sure the Japanese attack was successful.
and it is all true because I read it on the internet /s
There are a lot of books that deal with this topic—and while it is controversial and takes some work, that time will be rewarded if you put in the effort and pay close attention to all the details.
British code-breaking skills were far superior to American skills in the relevant time period.