Following the 2008 Beijing Olympics and Global Financial Crisis, China's foreign policy shifted to become more assertive, effecting a systematic deterioration in the US-China relationship. In 2017, the US' China policy shifted from that of 'engagement' to 'strategic competition' under Trump, which has remained under the Biden administration.Indo-Pacific Security: US-China Rivalry and Regional States' Responses explores how states in the Indo-Pacific region have had to adjust to the reality and implications of this growing great power rivalry. In the process, it fills a gap in the area studies, international relations, and security studies literature. It provides a compelling account of the trajectory of US-China relations while illuminating the varied responses of regional states: from Australia, India and Japan, to South Korea, Thailand, Taiwan, and Pacific Island states.