>>212154854 (OP)china here, tang dynasty had one of the most dramatic implosion in the history of the world in the an-shi rebellion
within decades tens of millions people died with the court running to chengdu, on the way the ministers strangled the imperial concubine yang guifei
yes tang was very strong but only for 1 or 2 generations, for 2/3 of its history it was a rump state