This is called bartering
It is the the exchange of goods or services between two or more parties with out the use of money or coin.
Answer:
they made them get stronger I believe
Explanation:
there's British were very powerful and wouldn't let anyone beat them
It was a very popular practice during its time. Europe transported many of their good to the colonies. They needed people to help work, so they captured slaves from African colonies.
OPEC stands for <span>Organization of Petroleum Exporting Countries.</span>