Andrew Johnson (1808-1875), seventeenth president of the United States, was the first president to be impeached.

Andrew Johnson was born on Dec. 29, 1808, in Raleigh, N.C. After serving an apprenticeship with a tailor, he moved to Greeneville, Tenn., where he opened a tailor shop in 1826. Johnson laboriously taught himself to read and write with the help of Eliza McCardle, whom he married in 1827. His business prospered, and Johnson entered the rough-and-tumble world of politics, becoming a formidable stump speaker.

A Jacksonian Democrat, Johnson moved up through local elective offices to U.S. senator in 1857. In the Senate he crusaded for a homestead law and was bitter when the South blocked its passage. Yet he supported Jefferson Davis's demand for a congressional guarantee of slave property in the territories and in 1860 backed the proslavery presidential candidate.

When the Southern states began seceding, however, Johnson was the only senator from...