From the Ebony article, one of the two links I left for you:
"How did the Russians use these fake accounts? They spread disinformation designed to hurt Hillary Clinton. These sites spread false rumors that “Hillary received $20,000 donation from the KKK towards her campaign” and advocated that Black voters stay home or vote for Jill Stein, the Green Party candidate. "
The same article did place blame on Clinton:
"African-Americans represent
25 percent of all Democratic voters and Democratic presidential candidates need strong support from the African-American community to win. African-American voters put Obama over the top in 2012. But Obama energized the Black community in ways that Clinton did not. Much of the Clinton campaign’s focus was directed at attracting the support of White suburban women. This came at the expense of shoring up the
support of African-Americansand other core Democratic groups.
This gamble failed to pay off. Clinton
lost the majority of White women and lost support among African-Americans. Her failure is especially glaring given the
massive increase in Black turnout during the 2018 midterms."
To provide a fuller answer regarding Russia targeting of black voters would require a great deal of work and research on my part. I'm not going to do that for you. Sorry, but you can do that. I thought I was simply pointing out another component of the Russian active measures campaign against our democracy in 2016. Any further research will have to come as a result of your own efforts, unless someone else wishes to weigh in.