Why did European overseas voyage upset the Portuguese?

A major reason Europeans mounted sea voyages in the 1400s was to find shipping routes for easier trade with Asia for spices and textiles. Portugal made early advances in voyaging due to a longstanding maritime culture and a stable monarchy, as well as the leadership of Prince Henry the Navigator (1394-1460).

Explanation:

which time period is this? or is this story fictional, i'm going to need more info to answer this question

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