Few roads loom as large in the American imagination as Route 66, which turns 100 this year. Officially established on November 11, 1926, as one of the United States’ first federally designated highways, it stretched 3,940 kilometers from Chicago to Santa Monica, linking the industrial Midwest with the wide-open promise of the West. In its early years, Route 66 served as a vital commercial artery, stitching together countless small towns across Illinois, Missouri, Kansas, Oklahoma, Texas, New Mexico, Arizona, and California. During the Dust Bowl of the 1930s, it became a lifeline for thousands of displaced families heading west in search of work, earning the epithet “Mother Road” in John Steinbeck’s 1939 classic The Grapes of Wrath. The highway entered its golden age after World War II. Neon-lit motels, roadside…