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Alien invasion is a science fiction theme in which extraterrestrial life attacks Earth with the intent to conquer it. The classic treatment was The War of the Worlds by H.G. Wells.

Other treatments have posited biological invasions ( Invasion of the Body Snatchers), or cultural invasion ( The Uplift Wars by David Brin).

Alien invasion was a common metaphor in science fiction during the Cold War for the fears of the American people.

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Alien Invasion at a site discussing threats (likely and unlikely) to the future of life on Earth

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Topics: Alien Invasion, Alien And Sedition Acts, Alienation...

AlienFor the 1979 movie, see Alien (movie). For live organisms which are not from Earth, see Extraterrestrial life Aliens are foreigners to their surroundings. The word is commonly used in law to denote non- citizens of the country of their whereabouts, and in	Alien and Sedition ActsThe Alien and Sedition Acts were passed on July 14, 1798 under the administration of President John Adams. They were supposed to protect the United States from "dangerous" aliens, but were used by the Federalists to stop the growth of the Democratic-Repub	AlienationAlienation is estrangement or splitting apart. In law, "alienation" refers to a transfer of title. In medicine, "alienation" can refer to a splitting apart of the faculties of the mind; an " alienist" is an old name for a psychiatrist. In sociology, "alie
Alien (movie)Alien ( 1979), directed by Ridley Scott, is an extremely popular and influential science fiction/ horror film that spawned several sequels and imitators. Although the title characters are the highly aggressive extraterrestrial creatures, the real connecti	Alien Registration ActThe Alien Registration Act or Smith Act (18 USC 2385) of 1940 made it illegal for anyone in the United States to advocate overthrowing the government. It also required all non-citizen adult residents to register. Although initially targeting supporters of	Alien invasionAlien invasion is a science fiction theme in which extraterrestrial life attacks Earth with the intent to conquer it. The classic treatment was The War of the Worlds by H. Other treatments have posited biological invasions Invasion of the Body Snatchers ,
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