> The idea that open borders are a good thing is a very odd idea Passports were not common until the 20th century. Until then borders were mostly porous. Ther

> The idea that open borders are a good thing is a very odd idea Passports were not common until the 20th century. Until then borders were mostly porous. There did use to be other cases some people couldn't leave a geografic confines, they used to call them serfs.