How did foreign powers invade China? What kind of disaster did it bring to the Chinese nation?

Foreign powers used military aggression as a prelude to violating China's sovereignty politically, plundering China's wealth economically and anesthetizing the Chinese people culturally. It is a serious damage to China's sovereignty and territorial integrity, war reparations is the foreign powers of the Chinese people openly looting, in the war of aggression against China, but also openly looting China's wealth, wantonly destroying China's cultural relics and ancient monuments, foreigners low-priced acquisition of Chinese agricultural and sideline products for the purpose of exploitation, accelerated China's traditional agricultural atrophy and decline, resulting in the backwardness of the Chinese economy in modern China and the poverty of the people, so that modern China has become a semi-colonial and semi-feudal society.