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File:2nd millennium montage.png|From left, clockwise: in 1492, Italian navigator Christopher Columbus arrives in North America; the American Revolution introduces the concept of liberal democracy in the late 1700s; the Ottoman conquest of Constantinople; the Atomic Bomb from World War II; an alternate source of light, the light bulb; for the first time, a human being sets foot on the moon in 1969 ... en.wikipedia.org