This is use of pathos
Pathos is a rhetoric technique in which you use heavily loaded emotional words to get an emotional support from your listener or reader. Here you can see it in words like "oppression, most humble, repeated injury, Tyrant", and similar. Ethos would be if they explained why they are qualified to say that, while purpose and thesis are completely unrelated.
Also called the Economic system
Answer:
The wind allowed them to sail
Explanation:
Sailing ship is mostly being pushed by wind or some other climatic pattern.
People were using the monsoon route and the monsoon is transferring air mass from the ocean to the land.
Straits of Malacca are connecting Indian and Pacific ocean and those are opposite directions so for this kind of sailing sailors need to wait for the right wind directions, but surely the most important thing that they need is the wind.
Continued in practice only.
Hope this helps!