No it's not. While one can only speculate whether Margaret Sanger had any ulterior motives with the Negro Project in the 1930’s, Sanger's quote circulating on social media has been taken out of context from a letter in which she was describing a perception she wanted to avoid.
She gave access to low-income and minority women to have an abortion not because she wanted to exterminate them but I'm pretty sure this is because they didn't have access to abortions.
https://www.reuters.com/article/factcheck-pp-exterminating-idUSL2N2X11YN
