I don’t think you’ve made a strong case that immigration is needed, especially for a country as resource rich as America. That said you’re not advocating for mass immigration. I’m skeptical of claims that immigration is needed, similarly to economists saying inflation is needed. Migration is one of the tools used to suppress wages for the past 5 decades making inflation even more devastating to the middle class.
Discussion
I’m not making a case, just commenting
I'm not a geneticist, but history has had natural immigration by various groups seeking saftey and or resources since forever.. maybe good for genetic diversity and for disease adaptation? immigration is not needed if one means state-funded busses or plane rides.