None. The elevator was invented by the Romans a couple of hundred years before Christ. An African American named Alexander Miles did however add to the elevator patented by Elisha Otis in 1861. He made improvements to the doors and shaft, and had them patented in 1887.
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Ragtime was invented in the U.S.A but I don't know exactly where it was first invented or who did! Sorry I hope this helps still!
The first African-American girl to play soccer is Briana Scurry.
Madam CJ Walker became the first African American millionaire by owning a business dedicated to hair care products for African Americans. She also invented the hot comb.
It is unknown who the first African American born in the US Was however it was most likely a slave.
who was the first african american to behonored on a us postage camp