That was the Shang Dynasty.
D) perfection of the assembly line process of production
Before he was killed he was making many plans to bring the union together but since he was killed by a southern John Wilkes booth, people were enraged and this caused a little bit of a rage making it harder for the north to bring in the south into the union again( not 100% sure I am learning about this at the moment and reading a book about it , hope it helped
