Not so eerie, even apart from the minutes-long exposures. The US population in 1920 was 106 million; only 50% lived in cities (up from 25% of 38 million in 1870

Not so eerie, even apart from the minutes-long exposures. The US population in 1920 was 106 million; only 50% lived in cities (up from 25% of 38 million in 1870) . Today it's 80% out of 331 million.