[thaumasiotes]

> Average people living under pax Mongolia were not free to move about without good reason.

The legal situation varied, but regardless of the legalities there was no structure in place to enforce this.

> England overcame this with the demise of feudal systems.

Note that at around this time, England started passing laws that prohibited serfs from leaving their ancestral lands, and the reason the laws were suddenly passed is that the serfs had suddenly begun to leave. The laws had no effect on whether the serfs could leave, though; feudalism fell apart because the general population structure stopped supporting it.