Which two dynasties united and ruled China between the 600s and 1200s?

The two dynasties that united and ruled China between the 600s and 1200s were the Tang Dynasty (618-907) and the Song Dynasty (960-1279). The Tang Dynasty is known for its cultural flourishing and expansion, while the Song Dynasty is recognized for its economic development and technological innovations. Together, these dynasties marked a period of significant growth and stability in Chinese history.