The last two major chinese dynasties in its history were the

The last two major Chinese dynasties in its history were the Ming and Qing.

The Ming and Qing dynasties were the last two major Chinese dynasties in history.

They made a checks and balance system to equal power within the branches. the "check" meant that one branch would watch one branch and "balance" them if they were too powerful. if you want more info on this, i would just google checks and balance system.