2/ Getting into the weeds on the multiple reasons for decline would take a tweet thread a mile long. Suffice to say that complex societies seldom fall for a single reason. They can take an earthquake, corruption, inflation, war, or plague, but not several at once.
3/ But mainly they fall because the will to pay for its upkeep is no longer there. Most societies, like Rome, collapse when the collective weight of taxes, rules and regulations, originally implemented to make life better, become such a burden that collapse becomes preferable.
4/ But collapse is paradoxically seldom that. It's a gradual grinding, almost imperceptible string of things just degrading over time, until they're abandoned a good while before they are competely non functional.
6/ So now you were forced to rely more on local, simpler solutions. One day your water system fails, and the local craftsmen can only do a slap job. So now you fill in your pool and convert it to a pig sty. It makes sense. You can almost convince yourself it's an upgrade.
Loading suggestions...