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Influenced by the Cultural Revolution in mainland China and by general dissatisfaction with Portuguese government, riots broke out in Macau in 1966. In the most serious, the so-called 12-3 incident, 6 people were killed and more than 200 people were injured. On 28 January 1967, the Portuguese government issued a formal apology.
Shortly after the overthrow of the Portuguese dictatorship in 1974 in Lisbon, the new Portuguese government determined it would relinquish all its overseas possessions. In 1976, Lisbon redefined Macau as a "Chinese territory under Portuguese administration" and granted it a large measure of administrative, financial, and economic autonomy. Three years later, Portugal and China agreed to regard Macau as "a Chinese territory under (temporary) Portuguese administration". The Chinese and Portuguese governments commenced negotiations on the question of Macau in June 1986. The two signed a Sino-Portuguese Joint Declaration the next year, making Macau a special administrative region (SAR) of China. The Chinese government assumed formal sovereignty over Macau on 20 December 1999. The economy since then has continued to prosper with the sustained growth of tourism from mainland China and the construction of new casinos
