May I introduce to you the wall? There’s a whole wonder of the world that’s a wall: a Great one in China.
Also, there used to be people on those walls with pokey things that hurt. People outside the empire/nation/whatever they called it back then didn’t want to go near it when they weren’t supposed to, since they didn’t want to be poked by the pokey things.
With the invention of firearms, you can shoot a tiny pokey thing really fast! Pokey things have really advanced over the years, for the better or worse.
shalafi@lemmy.world 6 months ago
All a country could do was control choke points, and they had to fight up close and personal. Closest you could get to monitoring was paying scouts or dudes in towers. With the advent of vehicles, roads became more important, and more of a choke point.
But nothing would stop a random dude walking in from the Canadian forests and Mexican deserts. Other countries can give us other examples.