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How did the Treaty of Tordesillas divide overseas claims between Spain and Portugal?

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Map showing the transatlantic and global routes of major early voyages of discovery and exploration by Spain, Portugal, England, and France during the 15th and 16th centuries. The map traces the journeys of explorers such as Columbus, Cabot, Magellan, da Gama, and others, with labeled paths crossing the Atlantic and encircling Africa and South America, as well as lines of demarcation dividing Spanish and Portuguese exploration zones. — European exploration Map depicting the European exploration of the New World in the 15th and 16th centuries, including the voyages made by Christopher Columbus, John Cabot, Alonso de Ojeda and Amerigo Vespucci, Pedro Álvares Cabral, Ferdinand Magellan and Juan Sebastián del Cano, Giovanni da Verrazzano, Jacques Cartier, Sir Francis Drake, and others. The lines of demarcation represent an early division between the territory of Spain (to the west) and Portugal (to the east).

The Treaty of Tordesillas, signed on June 7, 1494, established a line of demarcation to settle territorial disputes between Spain and Portugal regarding newly explored lands.1

Initially, Pope Alexander VI had proposed a line 100 leagues west of the Cape Verde Islands, granting Spain rights to the west and Portugal rights to the east. Dissatisfied with this arrangement, King John II of Portugal negotiated to move the boundary further west. The final agreement set the line at 370 leagues (approximately 1,185 miles) west of the Cape Verde Islands.1

Under this division:
* Spain was granted exclusive rights to newly discovered and undiscovered lands to the west of the line.1
* Portugal was granted rights to lands to the east of the line.1

This adjustment proved significant as it allowed Portugal to claim the coast of Brazil following its discovery in 1500. The treaty effectively divided the New World into distinct spheres of influence, though other European powers never recognized this papal-sanctioned division.12