The following is the June 26, 2019 Congressional Research Service In Focus report, Taiwan: Select Political and Security Issues.
From the report
Taiwan, which officially calls itself the Republic of China (ROC), is an island democracy of 23.6 million people located across the Taiwan Strait from mainland China.
Since January 1, 1979, U.S.-Taiwan relations have been unofficial, a consequence of the Carter Administration’s decision to establish diplomatic relations with the People’s Republic of...
https://news.usni.org/2019/06/27/report-to-congress-on-taiwan-political-security-issues