WaPo: Mapping changes in the US youth population

[memphis]

This is a highly misleading representation. As jimrtex pointed out, there were far fewer babies born during the Depression and WWII versus a "normal" time. So, of course the 25-34 set was low in 1970. You could just as easily have done a comparison from 1980 and shown subsequent a drop in youth percentage just about everywhere. Where we've really grown substantially overall are the high immigration states.