What America would look like with zero immigration

During four years in office, President Donald Trump reduced immigration admissions in every way that American law makes possible without congressional approval -- cutting refugee numbers, deporting law-abiding members of American citizens' families and then finally halting all entry to the US amid the pandemic for a period before blocking the issuance of new green cards. In 2020, virtually zero migration was no longer just a thought experiment; it was, at least for a period of time, policy.