What is modern are states like we have now. Passports didn't exist before WW1 for example. The idea that people can't freely move across land and imaginary lines we call borders is a modern idea.
You have it backwards.
You have it backwards.
https://en.wikipedia.org/wiki/Passport
The history section has an example of a passport in the Old Testament and a lot of other examples where people needed travel documents and were limited in their travels way before the First World War.