Final answer:
Goa became the capital of Portugal's eastern trading empire in India.
Step-by-step explanation:
The city in India that became Portugal's capital of their eastern trading empire was Goa. Goa was a Portuguese colony from 1510 until it was annexed by India in 1961. It served as the capital of Portugal's eastern trading empire due to its strategic location on the west coast of India.
Learn more about Portugal's eastern trading empire in India