This part sets out important ideas about government. It says that “all men are created equal.” And they have “unalienable rights,” rights that no one may take away. These rights are “life, liberty, and the pursuit of happiness.” It says that governments are set up to protect these rights.
Agricultural yields were about 2 tan (a unit of about 110 pounds or 50 kilograms) of grain per mu during the Song dynasty, compared with 1 tan during the early Han and 1.5 tan during the late Tang.
