It is liked a brand recognization. For example, the US is known to produce quality keepers. Or if he is a striker from England, he must be good in the air. It is almost liked stereotyping. Italy: keepers, center defenders, attack midfielders. Argentina: playmakers. Brazil: attack midfielders who can score freekicks and dribble evry well, striker, wingbacks who are better in offensive than defense. England: strikers who are good in the air, right wingers, keepers(in the good old days). Norway: Strikers who are good in the air and likely to be big. Germany: defensive midfielder, strong & physical players in all position. Uruguay: defenders who are willing to do anything to stop you.