Decades: 290s BC 280s BC 270s BC 260s BC 250s BC - 240s BC - 230s BC 220s BC 210s BC 200s BC 190s BC
Years: 251 BC 250 BC 249 BC 248 BC 247 BC - 246 BC - 245 BC 244 BC 243 BC 242 BC 241 BC
... changed humanity's "old fashioned" views of itself.
Warfare was changed with the advent of new varieties of rifle, cannon, gun, machine gun, armor, tank, plane, jet, and ...
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