Final answer:
The Realist Perspective argues for the preparation for war due to other leaders' greed and power-seeking behavior, advocating for a strong military and strategic alliances.
Step-by-step explanation:
The perspective that might argue that the U.S. should prepare for the possibility of war in response to the greed and power-seeking behavior of other leaders, due to human nature, is the Realist Perspective. Realists assume that other states will act in their own self-interest, leading to a lack of trust among states. Because of this distrust, realists advocate for a strong military and strategic alliances to ensure that the state can protect itself in case others attempt to shirk their commitments or act aggressively. Realism also underpins policies that maintain security through a balance of power and deter potential threats by demonstrating a state's capability to defend itself.