His reunification of China marked the creation of what some historians call the ' Second Chinese Empire ' , spanning the Sui , T'ang and Northern Song dynasties .
Yang Jian quickly enacted a series of policies to restore China 's economy .
Yang Jian 's reunification of China marked the creation of what some historians call the ' Second Chinese Empire ' , spanning the Sui , T'ang and Northern Song dynasties .
Yang Jian quickly enacted a series of policies to restore China 's economy .