Answer:
During the age of exploration, the European found several territories that were less technologically advance than them. But these territories possess a lot of resources that they can sell with higher price to other European nations.
They colonize these territories and make the people work with little to no prices and sell the goods that they produced to wealthier countries.
This occurred for hundredths of years, and the European accumulated massive amount of wealth from this practice. The positive impact of the wealth still impacted by the newer European generation these days.