When the World Split in Two: The Spanish Arrival in the Americas

After Castile's fleet of 35 ships was defeated at the 1478 Battle of Guinea, the 1479 Treaty of Alcáçovas forced Queen Isabella I to surrender West African trade routes to Portugal. Following the capture of Granada in early 1492, the Spanish monarchs authorized Christopher Columbus to sail west from Palos de la Frontera on August 3, 1492. Chapters: Understand how the Spanish arrival in the Americas shifted global power and challenged established maritime empires. Following the defeat of the Castilian fleet at the Battle of Guinea, the 1479 Treaty of Alcáçovas forced a temporary retreat from West African waters. This video examines how Queen Isabella I navigated these restrictions, eventually authorizing expeditions that would fund the crown and bypass Portuguese maritime dominance. We trace the strategic decisions made after the fall of Granada, leading to the authorization of Christopher Columbus and the later expansion into the Andes under Francisco Pizarro. By analyzing these critical turning points, you will see how the Spanish arrival in the Americas was driven by both economic necessity and the desire to secure a new path for trade and wealth. Subscribe for weekly historical breakdowns, and comment which era of exploration you want to see analyzed next. 0:00 Intro 3:34 Dividing the Unknown World 6:44 Settlement and Devastation 10:03 The Fall of Tenochtitlan 13:21 The Pacific Antimeridian Dispute 17:15 Conquest and Collapse