Where did Britain and other industrialized nations get most of the raw materials they needed to make goods?

Less developed country

Explanation:

In order to maximize profit, business entities need to cut down as much cost as possible.

The price of acquiring materials from less developed countries tend to be a lot cheaper compared to acquiring materials from developed countries. This was the reason why a large portion of companies in industrialized nations opened up their factories in the less developed countries.   and sell their finished product to developed countries (since they can put a higher price,

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