Question

What would have been a better solution rather than expelling Jews and Muslims from Spain?

Answer 1

Maybe expelling the Christians ;). But if we look at it seriously, people should learn to adapt and live with each other, without thinking that someone is under their level, not worrh the citizenship etc.
I hope this helps!

Answer 2

They could’ve worked together to find a solution for all 3 religions to live in the are peaceful. Maybe create a treaty, this would assure that everyone was treated fairly and that the land would be shared amongst them.