In episode three of 'Flashback,' host Sean Braswell explores the unintended consequences of making the nation's capital livable year-round. Thanks to the spread of air conditioning during the 20th century, places like Washington, D.C., became far more habitable during the summer months, triggering one of the biggest internal human migrations in history and laying the groundwork for the expansion of the U.S. federal government and a new political geography — one that continues to impact our elections today. |