Though Abraham Lincoln took center stage in a divided country, a political rival-turned-ally had a major influence on national affairs during Lincoln’s presidency. William Henry Seward, U.S. senator and former governor, lost the Republican Party nomination for president in 1860, but aided Lincoln’s election by touring the country on behalf of the Republican ticket. As some Southern states prepared to withdraw from the Union, Secretary of State Seward sought to reunite the country. This biography explores Seward’s political power and the theory that, as president, he might have prevented the Civil War.