Why did Spain not enter WWII?

by OriginalOhPeh

Given the German support for Franco during the Spanish Civil War, what reasons did Franco have for not joining the Axis and pushing North into France? Was rebuilding alone the the main issue, or were there other reasons as well to not fully support the Axis?

crrpit

This has been asked and answered a few times in the past - including my own effort here, as well as a few older answers that can be found in the FAQ. Of course, more can always be said and I'm happy to try and address any follow ups.