Legend builds this thesis through the lens of zero-sum thinking — the idea that for one person to gain, another must lose. He traces this mindset through American history: efforts to exclude, dominate, and subjugate workers, women, Indigenous people, Black people, immigrants, and the LGBTQ community, all driven by fear that if those people did better, people at the top would lose out. But the miracle of the American story, he argues, is that in its best moments, expanding opportunity proved those fears unfounded. When more people earned more, businesses got more customers. When excluded voices were finally heard, national conversations got better, truer, smarter. The line — borrowed from Paul Wellstone — becomes Legend's framework for everything from criminal justice reform to voting rights to the pandemic response.