How did writing help unit the people of China?

Like Semitic writing in the West, Chinese script was fundamental to the writing systems in the East. Until relatively recently, Chinese writing was more widely in use than alphabetic writing systems, and until the 18th century more than half of the world’s books were written in Chinese, including works of speculative thought, historical writings of a kind, and novels, along with writings on government and law.

a king decides to declare war on a neighboring country without the input of any advisers