 Complete the following phrase:  The marriage of Ferdid II of Aragon and Isabella I of Castile in 1469 created a dynastic union between the Crowns of Aragon and Castile, and both realms kept their own laws, institutions, borders and currency. In 1492 the Spanish colonization of the Americas began, political power began to shift away towards Castile. Tensions between Catalan institutions and the Monarchy, alongside the economic crisis and the peasants revolts, caused the 