The famed Route 66 has had many lives. It emerged in an era when cars were new but roads were dangerous and intended for horses. But there were those who imagined a highway that would connect the cities of the Midwest to the West Coast — and Route 66 was born.During the Great Depression, the roadway helped migrants find their way to new jobs in the West. During World War II, it facilitated the transportation of munitions and armaments en route to the Pacific theater. Later, it became a busy thoroughfare for Americans wanting to explore their country.  Storefronts, towns, gas stations, cafes and much more grew up along its edges. Then, as major interstates became the main byways for traveling Americans, Route 66 fell into obsolescence, becoming more a time capsule than roadway. Today, some of those roadside stops still exist, catering to tourists seeking a dose of unvarnished Americana.This episode chronicles the origin of the federal interstate system and how Route 66 fits into that history — before the massive tangle of highways and roads we know today were paved and packed with traffic.To subscribe to “There’s More to That,” and to listen to past episodes about an interactive map commemorating the 250th anniversary of the United States, the ongoing fascination with the sinking of the ’Edmund Fitzgerald’ and the moving return of personal belongings to the Rosebud Sioux tribe, find us on Apple Podcasts, Spotify, iHeartRadio or wherever you get your podcasts.“There’s More to That” is a production of Smithsonian magazine and PRX Productions. From the magazine, our team is Ari Daniel, Debra Rosenberg and Brian Wolly. From PRX, our team is Ali Budner, Cleo Levin, Genevieve Sponsler, Sandra Lopez-Monsalve and Edwin Ochoa. The executive producer of PRX Productions is Jocelyn Gonzales.Fact-checking by Stephanie Abramson.Episode artwork by Emily Lankiewicz. Images via Library of Congress and public domain.