Hong Kong was a British colony and dependent territory for 155 years (1842–1997).** Its colonial acquisition unfolded in three treaty stages, each expanding British control:
The New Territories comprised **92% of Hong Kong's land** and half its population. The 99-year lease made the colony's long-term viability dependent on the New Territories' water, food, and housing supply. When the lease expired, Britain negotiated the **1984 Sino-British Joint Declaration**, agreeing to return **all of Hong Kong** (including the ceded-in-perpetuity areas) to China on **July 1, 1997**, under the **"One Country, Two Systems"** framework guaranteeing capitalist economy and civil liberties for 50 years (until 2047).
Hong Kong's colonial past remains visibly etched in its architecture, institutions, and global orientation—even as its political future is now inseparable from mainland China.