Which country destroyed the Qin Dynasty?

Qin was destroyed by Liu Bang. Because the symbolic time of Qin's demise is: in 207 BC, Prince Qin Ying surrendered to Liu Bang.

Peasant War at the end of Qin:

After Chen Sheng’s uprising, Xiang Liang, son of Xiang Yan, a famous old Chu general, and Xiang Liang’s nephew, Xiang Yu, killed the governor of Qin Kuaiji in Wu (now Suzhou, Jiangsu). Raise troops in response.

Soon Xiang Liang led 8,000 soldiers across the river and went north. The team expanded to 60,000 to 70,000 people and won the battle. The nobles of Fujian and Yue, Wu Zhu and Yao, also led their people and followed Qin Fanyang to order Wu Rui to rebel against Qin. Liu Bang, the former pavilion chief of Peixian County, and some of his prisoners fled to Shanze. They also attacked Peiling and rebelled, and joined Xiang Liang's army.

Xiang Liang made the grandson of King Huai of Chu the king of Chu. Later, Xiang Liang was defeated and killed in Dingtao, and Qin Zhanghan's army turned north and crossed the river to attack Zhao. At this time, Wang Li, who replaced Meng Tian and guarded the Shuofang border fortress, also led his army out from Shangjun (governing southeast of today's Yulin, Shaanxi) eastward and surrounded Julu City (today's Pingxiang, Hebei) where Zhang Er and Zhao Wangxie were stationed.

The King of Chu sent Song Yi and Xiang Yu to rescue Zhao, and sent Liu Bangxi to Guanzhong. Song Yi went as far north as Anyang and stayed there. Xiang Yu killed Song Yi and led his troops across the Zhang River. After a fierce battle, he broke the siege of Julu and was promoted to the general of the princes. Later, Qin general Zhang Han led 200,000 people to surrender to him.

Liu Bang entered Wuguan in a roundabout way and arrived near Xianyang. At that time, Qin II had been killed by Zhao Gao, and his successor Ziying was demoted from the imperial title, named King of Qin, and surrendered to Liu Bang. Liu Bang captured Xianyang and Qin fell.

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The Qin Dynasty (221 BC - 207 BC) was the first unified dynasty in Chinese history that developed from the Qin State during the Warring States Period. A unified centralized feudal dynasty, Qin, was born, with two emperors and one king, and the country reigned for fourteen years. Because the royal family of the Qin Dynasty had the surname Ying, it was also called Ying Qin in the history books to distinguish the regime from other countries named Qin.

The State of Qin was originally a vassal state in the Zhou Dynasty. After Qin Shihuang succeeded to the throne, he successively attacked and destroyed the six kingdoms of Guandong from 230 BC to 221 BC, completing the unification of China. Later, he attacked the Huns in the north and merged with the Xiongnu in the south. Baiyue established a dynasty with an unprecedentedly vast territory. After the death of Qin Shihuang, Qin II Hu Hai and Zhao Gao conspired to tamper with Qin law, leading to a peasant uprising in the late Qin Dynasty. In 207 BC, Prince Ying of Qin surrendered to Liu Bang, and the Qin Dynasty was destroyed.

Reference: Qin Dynasty_Baidu Encyclopedia