Answer:
He created a Line of Demarcation to divide the New World into two zones in order to settle disputes between Portugal and Spain .
Step-by-step explanation:
During the time of the great navigations, Portugual and Spain dominated the entire Iberian peninsula, besides being great potentials in navigation. Both Spain and Portugal want to dominate new trade routes and expand their territories. Portugul took advantage of this feeling, dominating a large part of the African coast, but when Spain discovered the American continent, Portugual felt threatened and fearing a territorial dispute, the Spanish king Fernando II of Aragon asked that Pope Alexander VI solve this possible problem.
The pope, in turn, created the Treaty of Tortesilhas that was a line that demarcated the American continent in two zones, where the smaller zone belonged to Portugual, while the larger zone belonged to Spain.