From George Washington's reluctant oath-taking through George W. Bush's leadership challenges after September 11, 2001, we view ambitious and fallible men through the new lens of the twenty-first century. Where did they succeed? Where did they fail? And what do we know now that we could not have known at the time?

On May 14, 1804, a party of explorers dispatched by President Thomas Jefferson set off up the Missouri River into America's newly acquired Louisiana Territory. Under the leadership of Meriwether Lewis and William Clark, the men of the Corps of Discovery would cross the continent and into history.