Over the last two decades, the political narrative of the "liberal coasts" and the "conservative heartland" has become something of a truism, leading many Democrats to write off much of the Midwest as a Republican stronghold. Today's polarized divide between rural and urban voters makes it easy to forget that things have not always been this way. The Liberal Heartland is a powerful reminder that the American Midwest has a progressive legacy that rivals the coasts.

Across twenty chapters, The Liberal Heartland traces the political history of this region from the post–New Deal period to the rise of the New Right and Donald Trump's right-wing populism. The contributors explore the way liberals and progressives across the Midwest fought for expanding environmental protection, engaged in community activism, developed a queer-labor coalition before Stonewall, struggled for women's rights and representation in the Plains states, opposed the death penalty, and mobilized for Indigenous self-determination, among other topics. In addition to well-known leaders like Harry Truman and George McGovern, the book highlights lesser-known figures, such as Lydia Cady Langer, Mary Jean Collins, Richard Hatcher, Jim Jontz, and Paul Wellstone.

A companion to the 2020 volume, The Conservative Heartland, The Liberal Heartland explores the history of the Midwest from a less-acknowledged perspective, recounting often forgotten stories that demonstrate the importance of the Midwest for New Deal liberalism and various forms of left-wing politics. This is a long-overdue book that represents a fresh look at the American heartland.