The conclusion summarizes the book’s findings while emphasizing the role of presidential personality in molding the US’s international conduct. In illustrating its arguments through the cases of Presidents Barack Obama, Donald Trump, and Joe Biden, this scholarship examines the US leadership’s foreign policy orientations and their interplay with the domestic and international structural constraints. The book demonstrates that while all three presidents sought to retain America’s global primacy, they employed different approaches in pursuing this task—approaches that, to a significant degree, were influenced by the impact of their individual biases, beliefs, and ambitions. The study’s final section reiterates its thesis that the profound structural changes in US politics and the world during a time of growing strategic uncertainty have elevated US presidents from the rank of primary actors in shaping American foreign policy to the role of a critical instance in balancing the entire international system.