National Geographic Channel dives into history on a quest to re-define Generation X. Each hour examines one major milestone of Generation X — from the premiere of “Reality Bites” to the remarkable presidential election of 2008 to the legalization of gay marriage — and then breaks it down to explore the political, cultural and economic forces at play. Using original interviews with gen X members and archival footage from the era, the series puts the Generation in the spotlight it has long deserved.