If we want to keep out alien invaders we have to be careful not to accidentally give them spaceships to travel. What does this statement mean? What are some things we can do to prevent alien invaders from taking over our ecosystems? How can we prevent uninvited guests?
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Answer:
The invasion scenario has been used as an allegory for a protest against military hegemony and the societal ills of the time. H. G. Wells' novel The War of the Worlds extended the invasion literature that was already common when science fiction was first emerging as a genre.
Prospects of invasion tended to vary with the state of current affairs, and current perceptions of threat. Alien invasion was a common metaphor in United States science fiction during the Cold War, illustrating the fears of foreign (e.g. Soviet Union) occupation and nuclear devastation of the American people. Examples of these stories include the short story “The Liberation of Earth“ (1950) by William Tenn and the film The Invasion of the Body Snatchers (1956).
In the invasion tro
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