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File:1790s montage.jpg|thumb|420x420px|From top left, clockwise: Atlantic slave trade and abolitionism gain momentum over Europe and the Americas, as bans began to be enacted in countries such as Denmark-Norway (1803), the United Kingdom (1807), and Union States of the United States (1808) in the subsequent decade, following movements and upheavals of awareness at this period; Now-iconic Peking op... Wikipedia