^Since I haven't been asleep yet, I think post a few links and ramble on the topic.
Diaspora: Total 45-50% from Bantu-speaking peoples and areas in Central, East, and South/SE Africa, including S. Cameroon (Fang, Maka..) to Angola (Kimbundu, Umbanda, Kikongo speakers), Mozambique (Makwa, Yao, Tsonga..) and the surrounding area + western Indian Ocean islands (Quirimba islands, which acted as European and Arab (slave+) trading posts and ports).
I wrote this before I found the quotes so it may overlap. To what became the United States: %'s do include SE Africa: Virginia received 17-25% from Central Africa whereas Igbo and Senegambians (Wolof, Serer, Fulani, Manding speakers, etc) were predominant. It's flipped in the Carolinas/Georgia: it's about 30-40% (newer research says the latter) combined through all the centuries but during some time periods as many as 70% of the Africans being shipped to this region were coming from Central Africa, with smaller numbers coming from those other groups. Other ports in America aren't as polarized as Virginia favoring Igbo/SG's and South Carolina favoring Angolans/(Ba)Kongo, so I didn't include regional no.'s. The Africans first brought over to America were from Angola (many Melungeons have this ancestry).
Recent studies of Central Africans in other areas of the Americas have
highlighted several themes. Among the most important are ethnicity, identity,
and the issue of the extent to which African culture shaped Afro-
Diasporic and American cultures. In the Louisiana Slave Database and the
Louisiana Free Database for 1719–1820 that Gwendolyn Midlow-Hall recently
published, for example, the author noted that of the 8,840 Africans of
identified ethnicities (of which there were 18 listed), the highest cluster was
for Congo, which accounted for 3,035 or 34.3% of the ethnicities listed.22
Data for the South Carolina Lowcountry for the period between 1730 and
1744 demonstrate that Central Africans accounted for 73.7% of the founding
slave population in this region. The fact that many of these slaves went
on to form the founding generation for many areas of the Lower South suggest
a significant Central African cultural presence. Despite this, however,
as yet there is little work available that examines the Central African cultural
impact in North America.
Total:
In any case, as the research on the
demographics of the slave trade had demonstrated, Central Africans were
ubiquitous in all regions. Indeed, they comprised nearly 45% or around
5 million of the 11 million Africans imported as slaves into the Americas
from Africa between 1519 and 1867.
Haiti also received a large percentage of enslaved Central Africans. Their
presence was particularly noticeable during the eighteenth century, when,
on the eve of the Haitian Revolution, Central African slaves accounted
for a little over half of the over 400,000 enslaved Africans in the colony.
Some regions far exceeded others
in the number of Central Africans they received. Brazil, for example, led
the way in importation of enslaved Africans from Central Africa.
Total 4,875,000/11,026,000 44.3
--Central Africans and Cultural Transformation, a great book which lines up with current research. I think I'll post a link.
Links:
http://www.cr.nps.gov/ethnography/aah/aaheritage/histContextsD.htm
http://uncpress.unc.edu/browse/book_detail?title_id=742 Great book, it's posted free somewhere on the net but I don't have the link handy. Lots of charts and numbers.
http://www.slavevoyages.org/tast/assessment/estimates.faces
Areas of interest: 'West Central Africa and St.Helena' + 'South-east Africa and Indian Ocean Islands'
http://africandna.com/ScienPapers\T...hondrial_DNA_and_the_Atlantic_slave_trade.pdf ...they have it at 5/13 Central/SE and 8/13 West, but as they state in the article itself "details are lacking". Much of the numbers/info people often quote comes from guesstimates from several decades ago.
On 23andMe alone, I've found cousins from West, West-Central, and East Africa (who's people speak both their language
and Kiswahili). Also
quite a few cousins from the various islands + South America: Bahamas, Barbados, Jamaica (several), Haiti,Trinidad and Tobago, Guyana (several).