There are simply fewer kids, people have been having less children, getting married later or not at all etc: https://www.insidehighered.com/news/2016/12/06/hig

There are simply fewer kids, people have been having less children, getting married later or not at all etc: https://www.insidehighered.com/news/2016/12/06/high-school-graduates-drop-number-and-be-increasingly-diverse https://www.insidehighered.com/news/2016/12/06/high-school-g...