nostr:npub1ptmc89knq87ntjwhcehfzexgu6uvfjh3skrtn2pkcc60smljm5ys696rn8 nostr:npub1yq6nd438v3cjy9yxj8ff2ne2wqamy3xc2f8kpkl3zq5nrynwvp7s320mz4 

Here’s a link to a UN document; replacement migration for several countries; European, Japan, Korea, Russia and USA. Page 73 for USA. Use page numbers at bottom of each page. There are several scenarios presented. Scenario 5.

https://www.un.org/development/desa/pd/sites/www.un.org.development.desa.pd/files/unpd-egm_200010_un_2001_replacementmigration.pdf