Portugal has three very important distinctions in the age of exploration: starting it, reaching India before any other european, and the only European territory in China prior to the 19th century; Macau. But Macau was still only one city, and what's a city to a massive island? Your goal, with a POD before the 19th century, and preferably before the 18th, is for Portugal to control the island of Hainan and be the premier maritime order in the gulf of tonkin.
- What does this mean for china as a whole? Does europe start chowing down?
- Indochina?
- What are the knock on effects for Portugal?
- Could Portugal use this to dominate vietnam or the Guangxi province?
- How does this Portuguese China interact with the rest of the empire?