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There were no African Americans prior to about 1550.
The African slaves were totally disenfranchised before the Civil War. They had no rights. They were basically treated like animals, and died by the masses.
in 1870 black African American slaves was able to vote
Planters in the Americas started using African slaves primarily due to the labor-intensive nature of cultivating crops like sugar, tobacco, and cotton. African slaves were seen as a readily available source of cheap labor, and their prior experience in agriculture made them well-suited for the demanding work required on plantations. Economic factors and the perceived racial hierarchy of the time also played a role in justifying the use of African slaves for labor.
In many cases, free African Americans were not wholly free. At some points prior to the Civil War, former slaves that had escaped could be recaptured, and after the Civil War, free slaves were limited in their career options, the locations of their homes, and even in where they could shop.
Some advantages of African slaves over Native Americans for European colonizers included their resistance to diseases like smallpox, their familiarity with agricultural practices such as rice cultivation, and their perceived ability to withstand harsh working conditions due to their prior exposure to tropical climates.
Prior to the conversion to Islam, the predominant religion of Persia was Zoroastrianism.
At a time (prior to the Civil War) when people of African descent were enslaved in America, there were also people of European descent who were not literally slaves, but who were so heavily dependent upon their employers as to have no real option of quitting or of finding other employment; they were therefore similar to slaves.
Judaism was one major religion.
Prior to the introduction of Buddhism, the most prominent religion of China was Taoism.
Slaves were considered one-third of a person. Three slaves were the equivalent of one person.
Slavery existed in the Americas prior to the formation of the United States in 1787. When the US Constitution was accepted, slavery was already there. The first African slaves were brought to the Jamestown colony in the 17th Century.