Why did global trade lead portugal to establish coastal outposts around the indian ocean

For the answer to the question above asking why did global trade lead Portugal to establish coastal outposts around the Indian ocean?
The book in our history class says to give Portugal control of trade routes to East Indies spices.

ANSWER
To give Portugal control of trade routes to East Indies spices.:-)

Several different things make up a culture like, how the people worship, their form of government, geography, and trade. religion is one of the most important things to a culture, it defines peoples life. their different beliefs form into festivities and events that merge with their culture. people that practice hinduism see cows as gods, so no doubt they would celebrate cows, and these celebrations would definitely merge with their culture. those that are buddhist live life trying to reach a certain level of peace, so no doubt would they change things in their life in order to correspond with their religion.