The United States total fertility rate (1.8 as of 2022) isn't that much different than a large chunk of Europe.
Per this: https://en.wikipedia.org/wiki/List_of_sovereign_states_and_d...
* France, Denmark, Sweden, Ireland: 1.8
* Iceland, Czech Republic, UK, Latvia, Netherlands, Belgium, Lithuania, Norway: 1.7
* Romania, Slovenia, Estonia, Albania, Slovakia, Bulgaria, Germany, Switzerland, Austria: 1.6
Yes, there's some countries that have even lower levels (eg Italy and Greece), but that's a large chunk of Europe with a pretty similar fertility rate to the United States. I wouldn't give America a pass on any future sort of demographic discussion regarding this. Heck, China (which you list at "terminal") has a fertility rate of 1.7.