From the Document: "The Hong Kong Special Administrative Region (HKSAR, or Hong Kong) is a semi-autonomous city located off the southern coast of Guangdong Province, People's Republic of China (PRC or China). The city was established as a British colony in 1841, and administered by the British government until 1997, when it was formally returned to PRC jurisdiction. More than 90% of Hong Kong's population is ethnically Chinese. The first language of the vast majority is Cantonese (a variety of Chinese different from the Standard Mandarin recognized as the national language by PRC law). English is also widely spoken and used in commercial and legal settings."
CRS In Focus, IF12070
Congressional Research Service: https://crsreports.congress.gov/