Spain, as a world-power, reached her apogee in the year 1580, when Juan de Garay founded Buenos Aires. In that year Portugal was united to the Spanish Crown, and the East Indies and Brazil doubled Spain's colonial dominions. But at the very same moment the first symptom of her decline appeared. For the first time it was proved to the world that she could not hold the seas against her young rivals from Northern Europe. Sir Francis Drake, the earliest harbinger of Britain's dominance on the seas, appeared off the Plate on his way to the Pacific. Spain had trusted that the difficulty of threading the Straits of Magellan would protect the South Sea, but Drake slipped through in a spell of favourable weather and found few Spanish ships which were fit to fight him along all the coast to Panama. Drake's wonderful raid humbled Spanish pride where Spain was thought strongest, and encouraged Englishmen to fight with a good heart, a few years later, the overwhelming Invincible Armada. In 1616 a great Dutchman, Schouten, found the passage into the Pacific around Cape Horn. This discovery revolutionised the navigation routes of the world. Heretofore the only practicable commercial route to the Pacific had been across the Atlantic to the north shore of the Isthmus. Nombre de Dios was the metropolis and the market where all the goods for South America were landed. Those intended to be sold on the shore of the Caribbean were sent along its coast, and those intended for the Pacific were carried overland to Panama to be shipped on coasters down to their destination. Direct communication across the Atlantic to Buenos Aires was forbidden by the Spanish government.