Answer:
The correct answer is 'Shipbuilding'
Step-by-step explanation:
Advanced shipbuilding in proper docks took place during the age of exploration and with the advent of colonialism.
The shipbuilding industry was of particular importance for American colonists as they needed regular transportation between England and America. Once, colonies were established and they became profitable, there was an even higher demand for strong ships that could cross the Atlantic Ocean.
Hence, the ship building industry based in Belfast and Liverpool were of immense importance.