The Taiwan issue is the most sensitive in Sino-US relations. Three joint communiques between 1972-1982 established the One-China policy and framework for relations. The US Congress passed the Taiwan Relations Act in 1979 to continue commercial ties with Taiwan and defend it if China uses force. However, Taiwan's democratization and identity have fueled debate over whether the One-China policy still applies. Maintaining cross-strait peace and stability amid changing dynamics is challenging both China and the US.