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December 20, 1999
Portugal transferred the sovereignty over Macau, which it had administered since the mid–16th century, to China.
Handover of Macau
The handover of Macau from the Portuguese Republic to the People's Republic of China was at midnight on 20 December 1999. This event ended 442 years of Portuguese rule in the former settlement, which began in 1557.
Macau
Macau or Macao is a special administrative region of the People's Republic of China (PRC). With a population of about 710,000 people and a land area of 32.9 km2 (12.7 sq mi), it is the most densely populated region in the world.