Abraham Lincoln (/ˈlɪŋkən/; February 12, 1809 – April 15, 1865) was an American statesman and lawyer who served as the 16th president of the United States (1861–1865). Lincoln led the nation through its greatest moral, constitutional, and political crisis in the American Civil War. He preserved the Union, abolished slavery, strengthened the federal government, and modernized the U.S. economy. On October 5, 1818, Nancy Lincoln died of milk sickness, leaving 11-year-old Sarah in charge of a household that included her father, 9-year-old Abraham, and Dennis Hanks, Nancy's 19-year-old orphaned cousin. Ten years later, on January 20, 1828, Sarah died while giving birth to a stillborn son; Lincoln was distraught over his sister's death.