No more Homeric heroes or chariots.
Ah the good old days lasted until people decided to hire mercenaries to protect your borders rather than your own citizens do it and when EVERYONE became too good to pick their own crops, wash dishes, haul trash etc etc etc
Mingle enough ‘outsiders’ with citizens and the takeover becomes easy as one is sponsoring their own demise.
I often say how different it would be if the Indians would have turned back the Mayflower.......instead, they played diplomat and allowed a handful of outlanders take over their land, eventually locking the Indians away ‘for their own good’.
One could point out that leave the borders open like we are and no telling where “WE” will be put ‘for our own good.
Point this little scenario out and ‘they’ scoff.