Imagine that the unlikely happens, and a democratic country elects a broadly libertarian government. Consistent with libertarian philosophy, the borders are opened, and residence is allowed for anyone who can pay for accommodation. Citizenship is granted in the normal way, with long-term residence qualifying you (e.g. after 5-10 years). Seeing an opportunity, China sends millions of its citizens over, enough to become an actual majority of the population, subsidises them so they can afford to live there, and gets them to pursue citizenship. After 5-10 years, they then vote en masse for the "Chinese People's Party", winning the election by sheer weight of numbers. The CPP then immediately votes to annex the formerly libertarian country to China in perpetuity. Alternatively, imagine the Muslim world sends millions of its citizens over, enough to become a majority, and once they gain citizenship in 5-10 years, they unify as a voting bloc, and elect the Shariah Law Party, which promptly enacts Saudi-style rules and regulations. The formerly libertarian country is now not so libertarian. What do any libertarians here think about this possibility? Does it mean that libertarian politics must take a strict line on immigration? Or be strict on citizenship? It will be impossible to stop this by a 'citizenship test' because applicants will simply lie and pretend to be libertarian in order to qualify.