I've moved this thread to the heraldry & tartans section, since it is discussing the history of a particular clan.

If I may suggest, you might wish to read "Polk's Folly: an American family history" by William R. Polk. I read it a couple of years ago for a talk I was giving on the founding father of the town where I reside, Springfield, MO, which was founded by John Polk Campbell, a cousin of President Polk.

Regards,

Todd