An argument from the power transition school of realist theory may stress the decline of which hegemon in the early twentieth century as making World War I possible?

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The power transition school of realist theory might stress the decline of Great Britain as a hegemon in the early twentieth century as a factor that made World War I possible. This decline in British hegemony would have disrupted the balance of power, creating a power vacuum and increasing the likelihood of conflict as other states sought to assert their dominance or reconfigure the balance of power in their favor.

An Argument from the Power Transition School of Realist Theory