The treaty of tordesilles allowed for any land discovered by going west to fall under Spanish dominion; this being how they claimed the Philippines. Despite this, the archipelago was the only region in asia Toledo claimed. Your challenge is to give spain lasting control over the island of borneo and the Malay peninsula (thus, the strait of malacca). The Philippines are also part of this colony, being part of the Malay archipelago
The territory needs to hold out at least a century. I imagine that a POD around the dutch revolt would help, since weakening their naval potential would naturally make things harder for the VOC
The territory needs to hold out at least a century. I imagine that a POD around the dutch revolt would help, since weakening their naval potential would naturally make things harder for the VOC