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A '''missile-defense system''' is a system that can stop incoming [[missile]]s by firing another projectile, such as an anti-ballistic missile, at it. The first anti-ballistic missile was tested by the [[Soviet Union]] in 1961, and the [[United States]] soon developed one also.<ref name="Stracqualursi">Stracqualursi, Veronica (May 31, 2017). [https://abcnews.go.com/US/history-us-missile-defense-systems/story?id=47753516 A brief history of US missile defense systems]. ''ABC News''. Retrieved May 31, 2017.</ref> The two countries signed the [[Anti-Ballistic Missile Treaty]] (AMB Treaty) in 1972, which [[conservative]]s like [[Phyllis Schlafly]] opposed.<ref name="Stracqualursi"/>

In order to eliminate the threat of a large-scale nuclear attack on the United States, U.S. President [[Ronald Reagan]] developed the [[Strategic Defense Initiative]], and missile-defense systems continued to develop afterward.<ref name="Stracqualursi"/> The U.S. successfully tested its missile-defense system in 2017.<ref>[https://www.foxnews.com/us/2017/05/30/us-conducts-successful-missile-intercept-test-pentagon-says.html US conducts successful missile intercept test, Pentagon says]. ''Fox News''. May 30, 2017. Retrieved May 31, 2017.</ref><ref>Parry, Hannah (May 30, 2017). [https://www.dailymail.co.uk/news/article-4556626/America-s-missile-defense-WORKS.html America's missile defense system WORKS: The Pentagon successfully shoots down a mock nuclear warhead over California in test of missile that will stop ICBMs reaching the US]. ''The Daily Mail''. Retrieved May 31, 2017.</ref>

A missile defense system – the ability to shoot down an incoming missile with a missile – ended the doctrine of [[mutually assured destruction]] (MAD) in favor of what Reagan termed Assured Survival.<ref>http://www.thereaganvision.org/the-reagan-vision/ </ref> [[Democrat]]s and [[liberal]]s vehemently opposed Reagan and clung to the anti-technology growth Doctrine of MAD, mockingly calling missile defense "Star Wars – a futuristic fantasy."<ref>https://youtu.be/tu1r_rlUtXg</ref>

==See also==
*[[THAAD]], a specific missile-defense system based in [[South Korea]]

==References==
{{reflist}}

[[Category:Missiles]]
[[Category:Weapons]]