LoL. There were exactly two political groups/parties to blame for the collapse of Northen Song dynasty and the following stagnation of everything in China.
They were Yuanyou(元佑党人) the reformists, and Yuanfeng(元丰党人) the conservatives.
Damn.
Now, there is a similar case in US.
I hope this time, politicians can do much better than ruin all good things.