evidence: Colonized by the Portuguese in the 16th century, Macau was the first European settlement in the Far East. Pursuant to an agreement signed by China and Portugal on 13 April 1987, Macau became the Macau Special Administrative Region of the People's Republic of China on 20 December 1999. In this agreement, China promised that, under its "one country, two systems" formula, China's political and economic system would not be imposed on Macau, and that Macau would enjoy a "high degree of autonomy" in all matters except foreign affairs and defense for the subsequent 50 years. However, following a multi-year crackdown by China against a pro-democracy movement in nearby Hong Kong, the governments of China and the Macao Special Administrative Region similarly worked to limit Macao's political autonomy by suppressing opposition activity in the 2021 legislative elections. [...] Constitution history: previous 1976 (Organic Statute of Macau, under Portuguese authority); latest adopted 31 March 1993, effective 20 December 1999 (Basic Law of the Macau Special Administrative Region of the People's Republic of China serves as Macau's constitution) amendments: proposed by the Standing Committee of the National People’s Congress (NPC), the People’s Republic of China State Council, and the Macau Special Administrative Region; submittal of proposals to the NPC requires two-thirds majority vote by the Legislative Assembly of Macau, approval by two thirds of Macau's deputies to the NPC, and consent of the Macau chief executive; final passage requires approval by the NPC; amended 2005, 2012