The only reference guide to Supreme Court cases organized both topically and chronologically within chapters so that readers understand how cases fit into a historical context, the 18^th edition has been updated with 20 new cases, including landmark decisions on such topics as campaign finance, Obamacare, gay marriage, the First Amendment, search and seizure, among others. Updated through the end of the 2021 Supreme Court session, this book remains and indispensable resource for undergraduate and law school students, lawyers, and everyone interested in our nation's laws and Constitution.