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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John L. O'Sullivan believed that race was the key factor in the rise and fall of empires and the history of nations. He subscribed to the belief in manifest destiny, which held that white Americans possessed a divine mandate to expand their civilization and spread their ideas across the continent, and beyond, at the expense of other races.