What you are asking for here is a history lesson from the enslaved's point of view. The true history about the slave trade has not been truly told. read more
There are Native people of the Americas on pictures and posters because the first New World slaves were Native American. Your first poster is not about Native Americas. They are clearly said to be Africans and are depicted as such. read more
Because racism supported the slave trade (by making life very, very hard for escaped slaves) and the slave trade supported racism (by providing a financial incentive to denigrate people merely due to the color of their skin and also by providing a need for a moral justification for chattel slavery which made theories of racial inferiority that much more seductive). read more