From the bloggers at Rolling in a RV.
When Route 66 was planned in 1926 it went through Santa Fe. Everything was fine until 1927 when New Mexico Governor A. T. Hannett lost the re-election. He blamed the politicians in the capital city of Santa Fe and vowed to get even with them.
He started a road project that would cut straight across New Mexico from Santa Rosa to Albuquerque and completely bypass Santa Fe. By 1937 the new route, NM 6, was paved and approved to become part of Route 66. A straight, less mountainous route makes sense but Santa Fe is much too pretty and interesting to skip so if you have time take the old alignment to Santa Fe.
To read the full story by Rolling in a RV, click here.