What are the major events in Yunnan's foreign exchanges in the Qing Dynasty?

After the establishment of the Qing Dynasty's rule over Yunnan, a large number of immigrants entered Yunnan and implemented the policy of "returning home", which objectively consolidated the unity of the country and promoted the development of the frontier. In the Qing Dynasty, the mining and metallurgy industry in Yunnan developed greatly, and the seeds of capitalism began to appear. Copper from Dongchuan, Yimen, Lunan and Yongbei (now Yongsheng), silver from Ludian, Baiyang (now Binchuan Niujing), Yongsheng (now Yunlong) and Maolong (now Cangyuan), tin from Gejiu, lead from Luoping and Jianshui are all famous. From 1743 to 1802, the average annual output of Yunnan copper industry exceeded 10000 kg, and the highest annual output reached 14000 kg, ranking first in the country.

After the Opium War, Yunnan entered a semi-feudal and semi-colonial society with the whole country and was invaded by imperialist countries headed by Britain and France. People of all ethnic groups in Yunnan launched a vigorous anti-imperialist and anti-feudal struggle. After 1856, the Hui, Bai, Yi and Hani people's uprisings led by Du Wenxiu and Li strongly supported the national anti-imperialist and anti-feudal struggle, dealt a heavy blow to the feudal rule of the Qing government and shattered the dream of imperialist division and invasion of Yunnan. In the Sino-French War from South Yunnan 1883 to 1885, people of all ethnic groups in western Yunnan intercepted the British "expedition" to Ma Jiali, defended Pianma and Ban Hong, and severely punished the French invaders. They won great victories in the anti-French struggle led by Xuanguang, Lintao, Xiang Chongzhou and Yang Ziyuan, and wrote touching patriotic poems.