End of the World

An alien race with technology that dwarfed that of earth, sent dummy aircraft to the airspace of the most dominant and powerful civilizations on earth, including the USA, Germany, China, Japan, England etc... All these countries panicked by the speed and force that appeared to be lunging toward them on satellite radar with the promise of destruction and certain death to their country!

These countries disregarded cool heads and responded with knee-jerk reactions. One country would attack their neighbors and any other armies they suspected might be part of the attacks without warning. These armies attacked one another in blindness, while the countries with nuclear bonds pressed their little red buttons effectively wiping out humanity in the course of a day.

After the decimation, aliens used their advanced technology to purify the air and invade the earth with no battles, no war, no deaths and, most importantly, no resistance.
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They set up a shrine for future generations to give thanks to the ancient human race for peacefully endowing their planet to them in a shameless and selfless manner. Inspiring the young to live their life emulating this ancient civilization from ancient earth.