What advantages did moving the song capitol from kaifene to hangzhou have for the song dynasty

The economy prospered and fertile land for agriculture.

Explanation:

The Song dynasty ruled China from 960 to 1279 CE. The reign split into two, including the Northern Song, which lasted from 960-1125 CE and Southern Song from 1125-1279 CE. The Northern part ruled by uniting China, with its capital called Kaifeng. The north state did not last for long as it invaded by the Jin state in the 12th century. The defeat led the Song to relocate their court to the Yangtze Valley that formed a new capital named Hangzhou in 1138 CE in Zhejiang province.

The loosing of the northern region did not deaden the booming economy. The trading ports of Hangzhou were Quanzhou and Fuzhou, which situated in the south and continue to thrive with cities where settlers took up permanent residence. The south was more fertile and continued to produce an excessive harvest.

it's lower nubia : ) good luck