Jesse is right about some things:
Black slaves did indeed build the wall on Wall Street for the Dutch
The Dutch however did allow Africans to own their own land until the slave revolt/uprising in 1641 in Niew Amsterdam (the original New York) and then stripped them of the privilege
The original slave market was where Wall St meets the East River
New York--by far--had the most slaves of any northern colony
Slavery was legal in NY State until 1827
IMHO, African Americans do not get nearly enough credit, in general, for what they brought to this country physically and culturally (this is NOT a call for reparations however.
Any idea what Jackson meant by that?