According to John L.O'Sullivan's Democratic Review,what was the key to the history of nations and the rise and fall of empires?

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According to John L.O'Sullivan's Democratic Review, the key to the history of nations and the rise and fall of empires was race. He believed that the Anglo-Saxon race was superior and destined to spread its civilization across the continent and beyond. This concept was known as Manifest Destiny, which was used to justify America's territorial expansion in the 19th century.