A quarter of a millennium has passed since the Founders declared our independence and established a nation based on radical ideas—which they deemed “self-evident”—regarding individual equality, consent of the governed, and rule of law tempered by “inalienable rights.”We have spent those years defining and redefining what America is and who Americans are. It has never been a clean or simple dialogue: Consensus is often fleeting, with answers’ clarity often varying according to the eyes of their beholders. At worst, it’s an argument that spurred a Civil War and underlies today’s bitterest disagreements. At best, it has generated a creative tension that has produced magnificent advances in art, science, and human liberty.The American story is not uniform, neither all good nor all bad. “Man’s capacity for justice makes democracy possible, but man’s inclination to injustice makes democracy necessary,” as Reinhold Niebuhr, one of our great theologians, once said. The American genius has been to create a blend toward progress. E pluribus unum: Out of many we are one. Our brief 250 years illustrate Niebuhr’s wisdom: Our achievements stretch from a declaration at a Statehouse in Pennsylvania to Stars and Stripes planted on the moon; our failures are tallied in tragedies starting with human enslavement and running through a bloody series of catastrophes and injustices, some self-inflicted, others perpetrated upon us.To capture the scope and sweep of the American story, we decided to survey leading scholars and thinkers in a number of fields, such as history, political science, and law. We invited them to contribute lists of their nominees in the categories you will find in this series. Many answered all of the questions, some a few, and a handful answered different questions entirely. All were thoughtful and thought-provoking, and we are deeply grateful for their contributions.We built these lists from their responses. Some results were predictable—yep, Abraham Lincoln was great—but many surprised. Taken together, they are our attempt to define our nation on its semiquincentennial. And we even gave a handful of conservative thinkers their say.Historian Arthur M. Schlesinger Jr., my father, was fond of describing history as “an argument without end.” Bruce Springsteen, the nation’s music laureate, riffs along the same lines. “America was born out of disagreement,” he said at a May concert in Washington, D.C. “It’s an argument, an ongoing, blessed, sacred argument—an argument about what course the country should take to form a more perfect union.” We offer these lists in that spirit, as a fresh avenue for the great and ongoing discussion of where we have been, who we are, and what we may yet become.—Robert Schlesinger, guest editorMethodologyWe reached out to scores of leading scholars and public intellectuals in fields such as history, the law, economics, political science, and media and asked them to offer their top-fives in over a dozen categories designed to capture our history in its fullness. We also asked the same of a smaller group of our friends on the right.We received nearly 100 responses. Some respondents completed all 13 lists, some fewer. We made the lists in these pages by simply tallying up the votes. In some instances, we felt logic dictated that we group them thematically—for example, putting the Reconstruction Amendments together, rather than counting them individually. The final lists here are admittedly somewhat subjective, in that in each category we decided on a number that constituted a critical mass of votes; that number was different for each category, since the n of each category was different based on the number of responses (for example, many more participants made best/worst presidents lists than court cases lists). For each category, we chose a cutoff point that seemed to us to represent substantial sentiment favoring inclusion of that person or event.ContributorsJonathan Alter, author and columnistEric Alterman, Brooklyn CollegeWilliam J. Antholis, University of Virginia’s Miller CenterCristina Beltrán, New York UniversityDavid Harry Bennett, Syracuse University Maxwell School of Citizenship and Public Affairs (emeritus)Mary Sarah Bilder, Boston College Law SchoolDavid Blight, Yale UniversityHeather Boushey, University of Pennsylvania Kleinman Center for Energy PolicyNadia Brown, Georgetown UniversityAndrew Burstein, Louisiana State UniversityBrandon R. Byrd, Vanderbilt UniversityDavid Canton, University of FloridaLizabeth Cohen, Harvard UniversityJohn Milton Cooper Jr., University of Wisconsin-Madison (emeritus)Robert Dallek, historianMatt Dallek, George Washington UniversityWilliam A. Darity Jr., Duke University Sanford School of Public Policy (emeritus)Matthew Dickinson, Middlebury CollegeRobert E. DiClerico, West Virginia University (emeritus)E.J. Dionne, Brookings InstitutionDaniel Drezner, The Fletcher School at Tufts UniversityKristin Kobes Du Mez, Calvin UniversityJames Fallows, writerJohn A. Farrell, writer and historianDrew Gilpin Faust, Harvard University (president emerita)Amy Fried, University of Maine (emerita)Beverly Gage, Yale UniversityDavid Garrow, writer and historianHenry Louis Gates Jr., Harvard University Hutchins Center for African and African American ResearchRoxane Gay, writer and cultural criticDavid Greenberg, Rutgers UniversityDarrick Hamilton, The New School for Social ResearchMichael Harriot, journalistNicole Hemmer, Vanderbilt UniversityElizabeth Hinton, Yale UniversityDavid Hollinger, University of California, Berkeley (emeritus)Nancy Isenberg, Louisiana State UniversityMichael Kazin, Georgetown UniversityDavid Kennedy, Stanford University (emeritus)Randall L. Kennedy, Harvard Law SchoolAmna Khalid, Carleton CollegeLarry Kramer, London School of Economics and Political ScienceKevin M. Kruse, Princeton UniversityJennifer L. Lawless, University of Virginia Frank Batten School of Leadership and Public PolicyNicholas Lemann, Columbia University Journalism SchoolMargaret Levi, Stanford University (emerita)Sanford V. Levinson, University of Texas at Austin School of LawDavid Levering Lewis, New York University (emeritus)Jen Manion, Amherst CollegeJane Mayer, The New YorkerLiza Mundy, journalist and authorMelissa Murray, New York University School of LawGeorge Derek Musgrove, University of Maryland, Baltimore CountyAryeh Neier, Open Society Foundations (president emeritus)Nell Irvin Painter, Princeton University (emerita)Richard Parker, Harvard University Kennedy School of GovernmentClaire Potter, The New School for Social Research (emerita)Andrew Preston, University of VirginiaLara Putnam, University of PittsburghEric Rauchway, University of California, DavisSam Rosenfeld, Colgate UniversityMiguel Schor, Drake University Law SchoolKate Shaw, University of Pennsylvania Carey Law SchoolJohn Sides, Vanderbilt UniversityTheda Skocpol, Harvard UniversityCandis Watts Smith, Duke UniversityPaul Starr, Princeton UniversityThomas J. Sugrue, New York UniversityJulie Suk, Fordham University School of LawJeremi Suri, University of Texas at Austin Lyndon B. Johnson School of Public AffairsJames Tejani, California Polytechnic State UniversityMichael Tomasky, The New RepublicRobert L. Tsai, Boston University School of LawSiva Vaidhyanathan, University of VirginiaLynn Vavreck, University of California, Los AngelesMichael Waldman, Brennan Center for Justice at NYUSean Wilentz, Princeton UniversityMaya Wiley, Leadership Conference on Civil and Human RightsIsabel Wilkerson, journalist and authorBrenda Wineapple, Columbia UniversityJohn Fabian Witt, Yale Law SchoolJulian E. Zelizer, Princeton University