By tracing the continuities and changes of U.S. Strategic ambiguity and One-China Policy framework between the Trump and Biden administrations, the book assesses how the foreign policy prism, through which U.S. leaders view China and Taiwan, has experienced a distinct alteration and subsequently led to a policy adjustment. Utilising a wide range of documents and primary material, such as White House documents (ranging from the Clinton to the Biden administrations) in conjunction with interviews with Taiwan officials, this volume brings a detailed portrait of past, present, and potential future U.S.-Taiwan-China relations. Moreover, it provides a succinct examination of U.S. foreign policy traditions such as internationalism, nationalism, and multilateral nationalism (providing a study of U.S.-China relations and policies from Nixon to Biden) and the resulting influence of such traditions on recent U.S. Cross-Strait policy. Presenting a comprehensive study of both the Trump and Biden administrations approach to Taiwan, this will be a valuable resource for any scholar or student of U.S. Foreign Policy, U.S.-Taiwan-China Relations and Cross-Strait Relations.