I think that where ever there was mining to be done, the Welsh and the Cornish figgered immigrating there was a good bet. Southwestern Wisconsin has descendants of Welsh and Cornish emigres.

http://www.cornishfest.org/the_great_migration.html

http://www.spartacus.schoolnet.co.uk/USAEwales.htm

...Beloitpiper will, no doubt, remind us about the Swiss settlements up there...he seems to have a fondness for New Glarus...

Best

AA