Recent increases in antisemitism across the United States have been too easily attributed to biased media or foreign influence, but these explanations miss deeper cultural shifts. The article argues that America's historical resistance to antisemitism was rooted in unique aspects of its identity, such as a shared experience of persecution, a sense of national chosenness based on values, radical individualism, displaced scapegoating, and admiration for merit. Over recent decades, each of these pillars has eroded, replaced by identity politics, historical revisionism, and a collapse in faith in the American Dream. As these changes take hold, antisemitism is becoming more mainstream and politically useful, with both major parties reluctant to confront it within their own ranks. The author warns that unless America rediscovers the values that once made it exceptional, it risks following the path of other societies that once welcomed Jews, only to later turn against them.