Why was Route 66 called 'America's Main Street' and which different cities did it pass through?

Over the years, US 66 received numerous nicknames. Right after US 66 was commissioned, it was known as "The Great Diagonal Way" because the Chicago-to-Oklahoma City stretch ran northeast to southwest. Later, US 66 was advertised by the U.S. Highway 66 Association as "The Main Street of America".

Explanation:

Route 66 is probably the most famous road in the world. No other stretch of asphalt has been the subject matter of so many novels, movies, songs, and television shows. Route 66 is America’s Main Street. And to Europeans like us, it is a symbol of America.

Explanation:

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