The United States-Australia alliance has been an important component of the US-led system of alliances that has underpinned regional security in the Indo-Pacific since 1945. However, recent geostrategic developments, in particular the rise of the People's Republic of China, have posed significant challenges to this US-led regional order. In turn, the growing strategic competition between these two great powers has generated challenges to the longstanding US-Australia alliance. Both the US and Australia are confronting a changing strategic environment, and, as a result, the alliance needs to...