In Spain, a strong dynasty was created primarily through the marriage of Ferdinand of Aragon and Isabella of Castile, who ruled jointly and united their kingdoms to form the basis of modern Spain. The marriage was arranged in 1469 and their union brought together two of the most powerful and wealthy regions of Spain. Together, they worked to consolidate their power and expand their territories, sponsoring the voyages of Christopher Columbus and pursuing a policy of conquest and colonization in the Americas. They also pursued religious unity in Spain by expelling Jews and Muslims and establishing Catholicism as the state religion. Their reign marked a period of great political and cultural significance in Spain, and their dynasty continued to rule Spain until the early 18th century.