Inter caetera

Inter caetera (among other (works)) was a papal bull.

Pre Knowledge
Pope Alexander VI determined after the discovery of America that all west of a certain line (480 km from the Cape Verde archipelago) belonged to Castile and all east to Portugal.

In the Tordesillas treaty, Castile agreed that this line was moved to the west (1770 km from Cape Verde). This line was about halfway between the Cape Verde (already Portuguese area) archipelago and the islands discovered by Christopher Columbus on his first trip and claimed by Castile. In the treaty they were called Cipangu and Antilia, but there is little doubt that this is about Cuba and Hispaniola.

The Zaragoza Convention was a treaty that governed the division of the world between Spain and Portugal.

In the treaty of Tordesillas, the world was divided into a Castilian and a Portuguese part. However, after Elcano was around the world, these problems arose. In the Atlantic Ocean the border was almost clear, but where it was in the Pacific Ocean, it was completely unknown. This was important because, depending on her location, both Castile and Portugal could claim on the Spice Islands (the Moluccas).

For several years, Castilian and Portuguese captains fought each other, until April 22, 1529, the Zaragoza treaty settled the matter. The line of Tordesillas was stretched by the Great Ocean to the east of the Moluccas, which became Portuguese. In return, Castile received a monetary fee.

Incidentally, the Zaragoza treaty was later violated by the Spanish colonization of the Philippines.

Activity
Impact of conquest by Spain and Portugal empires

2nd Activity
Draw a meridian depicting the Bula inter caetera

3rd Activity
define Portolan