Where the dumb people live

Seven percent of the U.S. population reported their ancestry as American.

The number who reported American and no other ancestry increased from 12.4 million in 1990 to 20.2 million in 2000, the largest numerical growth of any group during the 1990s⁵. This figure represents an increase of 63 percent, as the proportion rose from 5.0 percent to 7.2 percent of the population.

⁵American was considered a valid ancestry response when it was the only ancestry provided by a respondent.

This is a convenient map of stupidity, provided by the U.S. Census. The "Americans" live in the off-white counties, which trace a predictable outline. Predictable if you are a contemptuous New England elitist. Apparently knowing what the word "ancestry" means is enough to make you an elitist.