The constitution ensures a smooth transition by designating a specific person for the job. If a president is unable to fulfill his duties, the vice president takes over the presidency.
The mass expulsion or killing of members of an unwanted etnic or religious group in a society
From all the changes that Qin made I think that one of the most important was the possibility that was given to the talented men from other states to acheive their goals. In fact, just a few of Qin's statesmen belonged to Qin's nobility, most of them were men from other states who brought their talent to work together in a unified China.
Here's the answer in picture form
