The colonies (13) would first pick up Africans from Africa, then travel back to the US to keep some for their own and then trade them to Europe. This is also known as the Triangular Slave Trade. If you are to look on a map, you can see that from Africa, to the US, then to Europe, it forms a triangle.
Europeans started to enslave Africans.
They started to use slaves instead of indentured servants, because the investment was better. Indentured servants only served for a few years, and then were granted freedom, while slaves were purchased and used for their entire lives. The investment of a slave was better than an indentured servant.
Historians look for causes and effects that help to explain how and why events happened.
Russia was called The Soviet Union in the past when they were communists
France was a wealthier country than Britain, and its national debt was no greater than the British one. ... The financial strain of servicing old debt and the excesses of the current royal court caused dissatisfaction with the monarchy, contributed to national unrest, and culminated in the French Revolution of 1789.