they worked developing large cities in the north
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Liberia was settled by freed American slaves in the early 19th century. It was founded as a colony by the American Colonization Society as a place for freed African-Americans to return to Africa.
African slaves
they needed cheap labor for their american colonies
Not enough.
A more unified African American culture began to emerge in the early decades of the nineteenth century because of the rapid transfer of slaves from one region to another. This process significantly minimized cultural differences.
The Native American population they had been using for slave labor died off in large numbers due to European diseases.
In early America, mostly. In the world, absolutely not. Our word "slave" comes from the world "slav," a European (white) people who were apparently taken as slaves a lot back in the day. Slaves could also be captured enemy soldiers of any nation, especially in the ancient world, when slavery was extremely common. Later on, kidnapping African tribesmen became the most profitable form of slavery.
As early as 1550 the Spanish brought slaves to Mexico . It is estimated that 12 million people were enslaved and were part of the early economics of the New Worlds.
African Americans as happy but lazy slaves
African Americans as happy but lazy slaves
were descendants of slaves freed around the early 1800s.