I think this is an important essay and I gave it 50 claps, but I do want to clarify that in this instance, these women fought against the 15th amendment because it did not also include women - and they thought it should. Although there was plenty of racism in the early suffragette movement, I think this statement is a bit of a mischaracterization of their motives. Anthony was friends with Frederick Douglas (and a lifelong Quaker abolitionist), although it was a complicated friendship in part due to their disagreement about the best path forward.

"She would not campaign for a federal amendment that enlarged the male electorate and left all women outside the body politic. Speaking to an audience of African-American men in New York City in June 1868, she opined, if voting “be an inalienable right, it is as much the right of the black woman as it is of the white. And you can’t ask it for any class of men, without asking it for all the women who are deprived of it.”[6] That was not an argument that could win over Frederick Douglass."

https://www.nps.gov/articles/000/fraught-friendship-susan-b-anthony-and-frederick-douglass.htm