Alexander Hamilton and Aaron Burr met on the dueling ground one fateful day, but their story started much earlier.

Following the Civil War, the Ku Klux Klan emerges to suppress and victimize newly freed slaves.

Learn key facts behind Bleeding Kansas, a series of violent confrontations between pro- and anti-slavery forces during the settling of Kansas, from historian Matthew Pinsker.

America was ready to expand westward, even if it meant going to war. Learn how and why the Mexican-American War happened.