Because the congressman Donald Keene and his leaders built the silos near Atlanta. Fun fact at best. Could have been anywhere. That’s Helen his future wife. The Georgia relics are cool in the TV series.

There are specific reasons why the people of 17 timeframes are odd. Wool and Dust of the Silo series address all of these things in detail. It is worth the read especially if you don’t want to wait. The Silo series is one of the best SciFi series I have read in a while.