Declining birth rate is a symptom, not a disease. Immigration may be a workaround but not a fix.
The key reason why young Americans don’t want to have children is because the cost of living including raising a child has been exploding for last 20yrs. Housing, healthcare, insurance, student loans and cost of education- all have gone up exponentially when the actual wages have not gone up.
Immigration is a workaround but it has inevitable side effects. Including dilution of labor, assimilation and not to say many Of the core issues mentioned above affect immigrants alike.