Want to find out what the Federalist Papers were? Not sure what ''ex post facto'' means? Wonder no more-these and other terms pertaining to the U.S. government can be found within BarCharts' up-to-date, 3-panel guide. Each term is bolded and defined for easy reference; in addition, all terms are divided into sections addressing particular topics, including the U.S. Constitution, landmark documents and the three branches of government.????