It&#x27;s historically inaccurate, but in practice true that without <i>slowing down</i> immigration it&#x27;s pretty much impossible to sustain a system in which people &quot;looking for work&quot; are entitled to higher PPP incomes and better services than labourers in virtually all the rest of the world. (But there are obvious drawbacks to taking things to the opposite extreme and banning all immigration: it might be a lot more difficult and expensive to run the NHS without immigrant healthcare professionals, for example)<p>But of course you&#x27;re right that borders have been closed by leaders believing they help enforce cultural and political stability for eons before that.