For the first time in U.S. history, the impeachment trial of an American president gets underway in the U.S. Senate. President Andrew Johnson, reviled by the Republican-dominated Congress for his views on Reconstruction, stood accused of having violated the controversial Tenure of Office Act, passed by Congress over his veto in 1867. At the outbreak of the Civil War in 1861, Johnson, a U.S. senator from Tennessee, was the only senator from a seceding state who remained loyal to the Union. Johnson's political career was built on his defense of the interests of poor white Southerners against the landed classes;...