One country, two systems
"One country, two systems" is a constitutional principle of the People's Republic of China describing the governance of Hong Kong and Macau since they became Special Administrative Regions (SARs) of China in 1997 and 1999 respectively. Since the passing of the National Security Law by Hong Kong in July 2020 however, many observers such as the United States have claimed that Hong Kong has reverted to a de facto "one country, one system." Additionally, the Hong Kong Bar Association and a number of governments have disputed the constitutionality of the law.