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The other area not producing footballers in the way that it used to is Scotland. When i was a kid, every league club had a number of Scots as is evidenced by the Scots managers of the 19080s and the pundits of all generations. No longer however.
This could be because in thoose days the only way out of the poor areas of Glasgow was through football but noew there are many other options. And now there are kids coming out of the poverty of Africa and Latin America.
There's a long read on Vice today on the decline of the North East as a football powerhouse which now isn't even producing players.