In what ways did the muslims develop a rich culture in spain and portugal before they were forced out of those lands?

The Muslim conquerors from North Africa built a number of Moorish architectures that were aimed at rivaling Damascus. They also introduced Islamic arts and clothing to the  area. There are also remnants of Islamic festivals in Spain up to date.

for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.