Answer:
Factories are being built and manufacturing is becoming more and more popular. Machines are doing the labor resulting in no need for slaves.
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When the colonies were under British control, the British did not want the colonies to intermingle with trading with other countries. Therefore, they were only allowed to trade with the mother colony (Britain). Then Britain traded with other nations.
Answer: maintenance/operation and construction
Explanation: I may not be right but atleast I tried.