The Sui, Song, and Tang
The Tang Dynasty became the center of trade in the east. The study of medicine, gunpowder, and the study of Law and Math were great achievements of the Tang Dynasty.
The Sui Dynasty was short lived, but it had a huge impact on the Dynasties following it. The Tang Dynasty adopted aspects of the Sui. The Emperor Yangdi the Grand Canal was built which helped to unify the country.
The gunpowder, moveable type, and paper money were some of the greatest Song achievements. The paper money became hugely popular and the silk and porcelain industries were outstanding.