How did Barack Obama make history in the 2008 presidential election?

Barack Obama made history in the 2008 presidential election as the first African American president of the United States. His election marked a significant milestone in American history, representing a major change in the nation's political landscape and progress in racial equality. The significance of his election transcended the political sphere, as it also resonated deeply with issues of civil rights and representation, inspiring many individuals across the country and worldwide.

While other options present notable points in a historical context—such as voter turnout trends and the significance of televised debates—the landmark aspect of Obama’s presidency is rooted in his groundbreaking identity as the first African American to hold the office, which challenged long-standing racial barriers and perceptions in the United States.