When Christopher Columbus made his discovery in The Americas during a Spanish-sponsored expedition, and began to shift Europe's trade and economic centre of gravity (and the focus of Spain's ambitions) from the Mediterranean to the Atlantic Ocean, undermining Catalonia's economic and political importance. Aragonese and Catalan power in the Mediterranean would continue, but efforts to achieve further Spanish conquests in Europe itself largely stopped and the maritime expansion into the Atlantic and the conquest of territories in the Americas was not a Catalan enterprise. Castile and the realms of Aragon were separate states until 1716 in spite of a shared crown and the newly established colonies in the Americas and Pacific were Castilian, administered as appendages of Castile, until in 1778 Seville was the only port authorized to trade in America, and despite the dynastic union Catalans, as subjects of the Crown of Aragon, had no right to trade directly with the Castilian-ruled Americas.