Actually, most of the above is untrue.
1) While the first Africans brought into the English colonies were given "indentured servant" status, they were not "African settlers who willingly exchanged work for food and board and passage to America." They were people who had been captured by other African tribes, and sold as slaves to the Dutch traders who brought them to Virginia.
2) The reason why they were granted "indentures" rather than immediately put into slavery is that slavery, by law, did not exist in Virginia at that time.
3) Slavery only came to exist later...in 1654...when one Anthony Johnson sued in a Virginia Court, claiming that he should be entitled to enslave one of his African indentured servants, one John Casor. Johnson won his suit, thus establishing that Africans could be legally enslaved in the English colonies in America. Ironically, Johnson himself was one of the original 20 Africans brought to Virginia by the Dutch slave traders in 1619, who had served out his own indenture, then, as a free man, acquired land and indentured servants of his own. He then got tired of losing his servants when their indentures expired, and decided to revive the old African custom of enslaving them.
Jycee is slightly off, but what he says is much closer to being true than that kind of revisionism that has become a popular claim among conservative apologists for slavery. I have no idea if you are, but at the least you've certainly fallen for the central premise. "Blame Blacks for slavery."
You even engage in an ugly bit of race-baiting by calling slavery "an old African custom." False on a couple of counts. Slavery is not uniquely African, obviously.
Slavery among African tribes, pre colonial plantation era, was largely limited to criminals and POWs, and the working conditions were not nearly as brutal as on plantations. There was no forced cultural assimilation, no hostility to African religions and language, often no enslavement of children as in colonies. In some cases slaves were put on display for conspicuous consumption, to show off the wealth of their masters. In some cases slaves could acquire the rights of tribal membership.
http://autocww.colorado.edu/~blackmon/E64ContentFiles/AfricanHistory/SlaveryInAfrica.html
The case you describe doesn't even fit African tradition at all. He's assimilated and using the European legal system.
Most historians would say Bacon's Rebellion is the central event which brings permanent racialized slavery to the colonial US.
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http://www.pbs.org/wgbh/aia/part1/1p274.html
....Bacon took it upon himself to lead his followers in a crusade against the "enemy."
....Each leader tried to muster support.
Each promised freedom to slaves and servants who would join their cause. But Bacon's following was much greater than Berkeley's
....
Bacon's Rebellion demonstrated that poor whites and poor blacks could be united in a cause. This was a great fear of the ruling class -- what would prevent the poor from uniting to fight them?
This fear hastened the transition to racial slavery.
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Bacon united both Black and white indentured to revolt. What the authorites did to prevent this uniting across racial lines was
offer Blacks as slaves to whites who fought vs Bacon.
After Bacon's Rebellion you start seeing Blacks almost exclusively as slaves in the colonies and whites only as indentured.