It is called Strategic Defense Initiative (SDI), or as some people call it: Star Wars. It was used to protect from missile attacks from outside countries, mainly the Soviet Union.
Two things that challenged the confederacy were diseases and population disadvantage.
Diseases challenged both sides and killed more soldiers than the battles themselves.
The other challenge was that the North has more soldiers, because the North has more people. So the Confederates were outnumbered.
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They disagreed on the role of the U.S. government
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The Age of Enlightenment was an intellectual movement in 18th century Europe. The goal of the enlightenment was to establish an authoritative ethics, aesthetics, and knowledge based on an "enlightened" rationality. The movements leaders viewed themselves as a courageous elite body of intellectuals who were leading the world towards progress, out of a long period of irrationality, superstition. The English philosopher and political theorist John Locke laid much of the groundwork for the Enlightenment and made central contribution. His political theory of government by the consent of the governed as a means to protect life, liberty and estate. His essay on religious tolerance provided an early model.
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