Answer:
Social changes that occurred in China during the Tang and Song Dynasty were a new upper class. The position of women worsened.
Step-by-step explanation:
The Song Empire (960–1279) was generally prosperous and at the time it was the world's most powerful empire economically, scientifically, and militarily. However, the Song Dynasty came under constant threat from northern enemies, and after 319 years they were conquered by the Mongols.