AHC: Spanish Empire with no sistema de las castas, but the OTL territorial extent

How can you have the Spanish Empire get as big as it did OTL, without the race caste system?

Is that even possible?

How would a Spanish New World without the caste system differ, other than not having a caste system obviously, from OTL?

Would there be less European immigrants, because they don't get more privileges than slaves, natives, mestizos, and criollos?
 
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