1, the war of aggression against China launched by Britain: Opium War; The second opium war; Eight-Nation Alliance's war of aggression against China;

2. British-occupied territory of China: Hongkong.

(1) The origin of the Hong Kong issue:

184 1 year, the British occupied Hong Kong Island; 1842, Britain forced the Qing government to sign the treaty of nanking and occupied Hong Kong Island. 1860, Britain occupied the Kowloon partition through the Beijing Treaty; 1898, in the frenzy of imperialist partition of China, Britain forcibly leased new territory.

(2) the return of Hong Kong:

In the 1980s, China and Britain signed a joint statement on the Hong Kong issue.

China resumed the exercise of sovereignty over Hong Kong, and Hong Kong returned to the embrace of the motherland.

(3) Significance of Hong Kong's return: Hong Kong's return to the motherland has washed away the century-old shame of the people of China and marked an important step on the road of China's reunification.

(4) Reasons for the loss and return of Hong Kong:

The reasons for the fall of Hong Kong: the corruption and backwardness of the Qing government; British aggression;

Reasons for Hong Kong's return: the victory of the new democratic revolution led to the establishment of a new China; After the reform and opening up, China's comprehensive national strength has been significantly enhanced and its international status has been continuously improved; Deng Xiaoping's great concept of "one country, two systems" has paved the way for the return of Hong Kong. Reunification is the common aspiration of the people of the whole country; Unremitting diplomatic negotiations;