What parts of China's ancient history were ceded to foreign countries?

1. Lianyungang area: In 208 BC, when the Qin Dynasty ceded Shandong and Henan to the kingdom of Xichu, it also assigned the present Lianyungang area to Xichu. 2. Central Plains: In 230 BC, in the battle of Handan between Zhao and Yan, Zhao was defeated and part of the Central Plains was ceded to Yan. 3. North of Helan Mountain: In 160 BC, after the marriage between the Han Dynasty and Xiongnu, the Han Dynasty ceded the area north of Helan Mountain to Xiongnu. 4. Northern Vietnam: 65438 BC+065438 BC+065438 BC, northern Vietnam was ceded to South Vietnam by the Han Dynasty. 5. South of Dianchi Lake: In 109 BC, after the Han Dynasty got married with Dawan State, the Han Dynasty ceded the area south of Dianchi Lake to Dawan. 6. Taiwan Province Province: 1662, after the Dutch colony in Taiwan Province Province was conquered by Zheng Chenggong, the Dutch ceded Taiwan Province Province to Zheng Chenggong. 7. Kowloon Peninsula: 1898, the Qing government leased Kowloon Peninsula to Britain for commercial and military activities. Since then, the area of Hong Kong has expanded, and the Kowloon Peninsula is also under British rule. 8. Macau: 1557, in the trade agreement between Guangdong and China, the Portuguese gained jurisdiction over Macau. It was not until 1999 that Macau returned to China.