WHEN EMPIRES WANE - The end of power

Without American hegemony the world would likely return to the dark ages.
We tend to assume that power, like nature, abhors a vacuum. In the history of world politics, it seems, someone is always bidding for hegemony. Today it is the United States; a century ago it was Britain. Before that, it was the French, the Spaniards and so on. The 19th-century German historian Leopold von Ranke, doyen of the study of statecraft, portrayed modern European history as an incessant struggle for mastery, in which a balance of power was possible only through recurrent conflict. [...] Link (pdf)