Why is the Battle of Glorieta Pass called the "Gettysburg of the West"?

The Battle of Glorieta Pass halted the Confederate campaign to capture New Mexico and reach the western territories. Union forces destroyed the Confederates’ supply wagons, forcing them to retreat back to Texas. That decisive setback is why the battle is called the “Gettysburg of the West,” so the correct choice is “It stopped the Confederate advance and forced a retreat.”

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