Qin Shi Huang, the first Emperor of China, witnessed many regional differences in language, writing, and transportation resulting from the different states from which they came, so he took to the task of creating a unified system for the country. For example, he promulgated the official production of measures and weights as well as bronze vessels, creating a single system. He also forbid the writing of the Six States, using the Cangjie as the standard for Qin writing. Qin officials also became teachers in Qin writing.