Vasco Núñez de Balboa
Vasco Núñez de Balboa (; c. 1475around January 12–21, 1519) was a Spanish explorer, governor, and conquistador. He is best known for having crossed the Isthmus of Panama to the Pacific Ocean in 1513, becoming the first European to lead an expedition to have seen or reached the Pacific from the New World.
Salvador Fidalgo
The Spanish claim to Alaska and the Pacific Northwest had dated back to a 1493 papal bull (Inter caetera) and rights contained in the 1494 Treaty of Tordesillas; these two formal acts gave Spain the exclusive rights to colonize all of the Western Hemisphere (excluding Brazil), including the exclusive rights to colonize all of the west coast of North America. The first European expedition to actually reach the west coast of North America was led by the Spaniard Vasco Núñez de Balboa, which achieved the Pacific coast of Panama in 1513. Balboa claimed the Pacific Ocean for the Spanish Crown, as well as the lands touching it, including all of the west coast of North America. This action of Balboa further solidified the Spanish claim of exclusive control over the entire west coast of North America.