Slavery was the most common form of forced labor in History. Slavery was very bad and wrong. A slave was treated like property and not like a Human Being and owned by other Human Being's.
There were important people that related to Slavery. These people are the one of the most important people in Slave History. First was Harriet Tubman. Harriet Tubman was a runaway slave. She helped a lot of slaves escape by using the Underground railroad. The Underground railroad was a secret network of people who helped runaway slaves reach the north. Another person was Frederick Dougless. He was also an escaped slave who became one of the first black abolitionists and Civil Rights leader in the US. Abraham Lincoln started the emancipation proclamation. That had stated that all slaves would be freed on January 1st 1863. That had freed most of the slaves but not all of them.
What happened was that blacks were taken from their countries and made to serve white people. The Whites had come to the blacks colonies in huge ships and take blacks away from their family and sent to the ships. The black people were then all forced to sleep on slabs of wood, to eat just enough to keep them alive and to take orders from the white people. The ships were then sent to other countries to later be sold to forced to do work for whites. But then Aberham Lincoln later had declared the Emancipation Proclamation that freed most slaves ecept the ones that were in other countries.
Africa was a main place for gathering slaves. Mostly all slaves were taken from Africa. The United States was a place where slaves were used to work on plantations and serve their owners. All through out Europe slaveposts were being setup to sell slaves.
The capture of Africans by the Europeans began in the early 1500's. But slavery was done in the Ancient periods also. The Egyptians used slaves to build pyramids, the Chinese and Indian used slaves for large scale construction and Agricultural and the Hebrews also used slaves.
Slavery was done because Portugal needed agricultural workers. Soon Spain caught on. Then Arab traders in northern Africa took blacks and sent them to markets in Arabia, Iran, and India. Spanish Colonists first forced Native Indians to work the land but they could not survive it. So then they took blacks from Africa and made them work. Slaves were then sold like animals all over the States and Europe. They were sent to farms and Plantations to work long hours in inhumane conditions. In the south slaves were treated a bit better then in the north. The slaves in the south were mostly field slaves. The ones in the north did many things and were beaten and treated very poorly. That just about explains the who, what, where, when and why about slavery.