When Constantinople fell to the Muslims, they slaughtered the inhabitants, then rebuilt the City and invited Christians and Jews to come and do business in the city.
Nothing new here, then of course there were several Islamic invasions of Western Europe from the springboard of Spain, but hey, the Prince paid cash..
Cordoba was never anything but a sign of Islamic conquest. Since Islam is a “religion” that shuns learning and is anti-individual and anti-capitalistic, enforcing these things through its economic and political law (sharia), Muslims have always needed non-Muslims to actually work and produce income. Once they subdue or destroy the native population, they will then work out arrangements where certain productive groups (Christians and Jews) are allowed to remain simply so that they will have somebody educated and industrious enough to keep the tax revenue coming in.
Christians and Jews were never “equal” in Islamic Spain. If they were allowed to live and continue, it was only because this was more profitable to the Muslims, since we have all seen how well Islamic societies do once they exterminate their productive Christian and Jewish members. Look at the festering pits of poverty and ignorance that constitute Islamic lands.