@Zeb It won't be so much "you're not allowed to leave" as it will be "report anyone who talks about leaving the country, they might be a $CURRENT_BAD_THING".
They'll give you a hard time when trying to travel, maybe make getting a passport more difficult, etc. You might have to request an exception based on a protected reason, like religious pilgrimage, and then you'll have to travel directly to that destination.
It will always be possible, just not necessarily easy.
@VeganMGTOW The wall doesn't seem to be keeping them out. If it keeps Americans in, then that'll be how history remembers it.
@Mongoliaboo @Zeb Makes You think if the Trump wall in the Border with Mexico is to avoid illegal alien entering or is to avoid men fleeing the US?