Someone over here, stateside, might be excused for not keeping up with the politics in Europe. However, if you are a fan of the USMNT, you might want to take a look because the Brexit may end up hurting American players.
So a quick review of what the Brexit actually is. Brexit is the (awful-sounding) short-hand for the British exit from the European Union. The country held a referendum to decide whether the voters wanted to stay or leave, and they voted to leave. There are a number of different reasons people have for both staying and leaving.