The answer is stone. hope this helped!
In the theory known as mercantilism, nations measure their wealth by the amount of gold. Importing more goods than one nation exports results that wealth, mainly gold and silver, is exiting the country. Overseas colonies are nations access to wealth and raw materials. Instead of importing raw materials from other nations, having raw materials available made it possible for countries to create their own goods, which they could export and accumulate wealth. Also, by not relying on other nations, they become self sufficient which is the ultimate goal of mercantilism. During a large period of history, colonial forces of Europe were faughting wars for colonies.
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