巨大的鸿沟：US公众两极分化的驱动因素
The Great Divide: Drivers of Polarization in the US Public
摘要：
许多民主社会在政治上变得更加两极分化，美国就是主要的例子。这一现象的起源仍然没有得到很好的理解，并受到辩论。为了更好地理解政治极化的机制，我们开发了一个数学框架，并采用信息论概念来分析皮尤研究中心从1994年到2017年收集的关于政治极化的经验数据。我们的框架可以捕捉到美国公众中民主党和共和党倾向的两极分化的演变，并使我们能够识别其驱动因素。我们的研究结果提供了实证和定量证据，表明美国的政治极化主要是由民主党强大和更左倾的政策/文化创新驱动的。
英文摘要：
Many democratic societies have become more politically polarized, with the U.S. as the main example. The origins of this phenomenon are still not well-understood and subject to debate. To better understand the mechanisms underlying political polarization, we develop a mathematical framework and employ information-theoretic concepts to analyze empirical data on political polarization that has been collected by Pew Research Center from 1994 to 2017. Our framework can capture the evolution of polarization in the Democratic- and Republican-leaning segments of the U.S. public and allows us to identify its drivers. Our findings provide empirical and quantitative evidence that political polarization in the U.S. is mainly driven by strong and more left-leaning policy/cultural innovations in the Democratic party.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
