Why the US is crumbling.PB
The US replaces legislators every two years there by switching-out the very foundations of the country every two years. The same goes with presidential leadership - every four years a new president appears and undoes the previous administrations policies. Foreign policy changes. Infrastructure policy changes…etc.
You cannot constantly switch-out the foundation of any structure and expect it to last, especially so frequently. You must buttress the rest of the structure before doing any repairs to the foundation - America does not do this. China has survived so long because their leaders and their laws do not change much.