Historian Michael Vorenberg will give a talk on “The Fourteenth Amendment as an Act of War” on Sept. 20 at 5 p.m. at Barat House, Newton Campus. Vorenberg, an associate professor of history at Brown University, is the author of Final Freedom: The Civil War, the Abolition of Slavery, and the Thirteenth Amendment, which was a finalist for the Lincoln Prize, and The Emancipation Proclamation: A Brief History with Documents. One of his current book projects deals with the impact of the Civil War on American citizenship. Sponsors: The Clough Center for the Study of Constitutional Democracy and Boston College Law School Legal History Roundtable.