when there was more land to be farmed and farming to be done in the Western hemisphere, European powers started forcing African prisoners to come to the Americas and do labor.
Tobacco ruined the soil, so they decided to plant cotton which rejuivenated the soil. Since cotton (cash crop) was aiding the soil they needed a sorce of labor. They did not have enough labor here so they decided to buy Africans in order to get free labor for their cash crops.
oxidation-reduction reaction, also called redox reaction, any chemical reaction in which the oxidation number of a participating chemical species changes. The term covers a large and diverse body of processes.
