If you were asked when America became polarized, your answer would likely depend on your age: you might say during Barack Obamas presidency, or with the post-9/11 war on terror, or the culture wars of the 1980s and 1990s, or the Reagan Revolution and the the rise of the New Right. For leading historians Kevin M. Kruse and Julian E. Zelizer, it all starts in 1974.
view more