Why does the United States have two political parties that espouse such opposing philosophies? The Republicans fight for the conservative ideals of "individual rights -- and the responsibilities that go with them," from which flows the belief in limited government and few regulations. Democrats argue for the liberal notion that "we also rise or fall as one nation ... I am my brother's keeper, my sister's keeper," from which derives the support for social-assistance programs and universal access to health care. Why do these two parties -- and the divided populations they represent -- see "life, liberty and the pursuit of happiness" so differently? Is it cultural, or is there something innate in our biology that explains these differences?
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