How did the Eastern Jin Dynasty perish?

The Eastern Jin Dynasty was destroyed when Liu Yu usurped the throne.

In the winter of 417, Liu Yu ordered Liu Yizhen and other generals to lead his army back eastward. They were pursued by the Xia army and their vitality was severely damaged. This ended the Northern Expedition. After the fall of Guanzhong, Liu Yu began to actively seek the throne. In the same year, Liu Yu killed Emperor An of Jin and established his younger brother Dewen as Emperor Gong of Jin. In 420, Liu Yu deposed Emperor Gong of Jin and established himself, establishing the Song Dynasty, which was known as the Southern Song Dynasty in history. He was Emperor Wu of the Song Dynasty, and the Eastern Jin Dynasty was destroyed. After the Northern Wei Dynasty unified North China in 439, it entered the Northern and Southern Dynasties period. Extended information

The Eastern Jin Dynasty (317-420) was a political power established by Sima Rui, a clan member of the Western Jin Dynasty, who moved south. The Western Jin Dynasty, which had its capital in Luoyang, fell and was called the Eastern Jin Dynasty in history. In addition, the history books also imitate the Eastern Han Dynasty. It is called Zhonghan, and the Eastern Jin Dynasty is called Zhongjin, which means the resurgence of the Jin Dynasty; most of the areas ruled by the Eastern Jin Dynasty are in Jiangdong, which was called Jiangzuo in ancient times, so Jiangzuo is used to refer to the Eastern Jin Dynasty.

In the second year of Yuanxi (420), Song Gong Liu Yu abolished Jin An Emperor and established the Liu Song Dynasty. The Eastern Jin Dynasty was destroyed and Chinese history entered the Southern and Northern Dynasties period.

The Eastern Jin Dynasty was located in the south of the Yangtze River. On the other hand, the Eastern Jin Dynasty made certain achievements in literature. All kinds of poems, songs, and poems flourished in the Eastern Jin Dynasty. Famous writers, including Xie Lingyun, Tao Yuanming, Wang Xizhi and others, also popularized parallel prose. The background of the story of Liang Shanbo and Zhu Yingtai, one of the four famous Chinese folklores, also took place in the Eastern Jin Dynasty.

Reference: Baidu Encyclopedia-Eastern Jin Dynasty