What happened on route 66 to California?

Route 66, often referred to as the "Main Street of America," was a significant highway that connected Chicago to Santa Monica, California. During the mid-20th century, it became a symbol of freedom and adventure, playing a crucial role in the westward migration of families, especially during the Dust Bowl era. The route facilitated economic growth and tourism, fostering the development of roadside attractions and motels. However, with the advent of the Interstate Highway System in the 1950s, parts of Route 66 were gradually bypassed, leading to a decline in its prominence.