Yes, has been covered many times before, so (if the search feature is currently enabled) do a search and you'll find a wealth of information.
Briefly, though, advantages of going to America are that it is cheaper and you are less likely to get weather delays.
Disadvantages of going to America are that there are differences between flying in the UK and the US. For example, airspace is organised differently, radio terminology is sometimes different, there are different weather considerations. When you return to the UK, you will need several hours of dual instruction from a British instructor before you can safely and competently fly over here.
FFF
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