In the comments of a Paul Krugman blogpost, Ireland = Nevada, a Joseph OShaughnessy offers this interesting comparison between Ireland and Nevada.
The Irish are a homogeneous, well educated society. They have lived where they live, give or take 100 miles, likely for at least 500 [more like at least 1000-5000 years].
The Nevadans are, by and large, uneducated vagabonds. Their medical system is almost non-existent and where it exists, it should be banned. The oldest and most established citizens are themselves transients.