The current "peaceful" situation in the Taiwan Strait is primarily maintained through the policy of deterrence and assurance by the United States. A potential war between the U.S. and China over Taiwan would bring catastrophic consequences, emphasizing the crucial importance of preserving peace and security in the Taiwan Strait for all stakeholders. The U.S. policy of deterrence and assurance aims to uphold the status quo of "peace" by deterring China from attacking Taiwan unprovoked while assuring China that the U.S. does not support Taiwan's independence. However, the status quo preserving "peace" in the Taiwan Strait is undergoing changes due to three key factors: (1) China's increasingly aggressive stance in the Taiwan Strait since the mid-2010s, based on the "One China" principle and enhanced economic and military capabilities to forcibly annex Taiwan; (2) Taiwan's growing sense of self-determination that may lead to movements toward official independence; (3) The gradual shift in the long-standing commitment of the U.S. to the status quo in the Taiwan Strait, reacting to the aforementioned factors. To maintain the status quo of "peace," the U.S. must adjust its outdated engagement policy towards China with a stronger deterrence policy in the Taiwan Strait, effectively deterring China. Additionally, a firmer assurance policy is needed to convince China that the U.S. does not consider supporting Taiwan's independence. Due to changing variables, reaching a compromise for building lasting peace in the Taiwan Strait becomes challenging.