Currently 75 Nationalities have been played in the Premiership (discounting the home nations and Ireland). Here is the full list http://www.guardian.co.uk/football/2005/aug/24/theknowledge.sport1
http://news.bbc.co.uk/1/world/americas/502503.stm This is the link to the passenger list and their nationalities.
Man City and Chelsea
It is hard to get specific statistics of every single country represented, but you will find a list which includes many of them in the link below. Many countries are listed specifically but there are also several references to "Other" and "Other Nationalities" in it, so there would be more than the actual countries listed.
There are various Jewish footballers in the NFL. See the related link for a full list.
http://www.futebolfinance.com/en/os-50-maiores-salarios-de-jogadores-de-futebol-20082009/ Check this link & u will get ur Answer.
Alex Ferguson Kenny Daglish Arsene Wenger Jose Mourihno
Here is a site that will give you a list of Great Mexican artists: * http://www.artcyclopedia.com/nationalities/Mexican.html
there's stats and details of Irish footballers playing in Scotland and England here: Irish-abroad.appspot.com/GameDayDetails
The highest paid footballers from Africa in Europe are Samuel Etoo, Dider Drogba and Michael Essien.