' I think the figure of 1% of black Americans support him?'
That is a mainstream media (MSM) figure, the type of thing the Guardian and the BBC would reporty. It is not true.
"Trump's black support explodes in biggest battleground state
Trump has attracted the backing of a full 20 percent of black Americans in Florida, a poll by Florida Atlantic University and the Economics Polling Initiative found.
The survey, conducted Aug. 19-22 and released Wednesday, shows Democrat Hillary Clinton winning the support of 68 percent of Florida’s black voters.
Trump took an overall lead in the state, 43 to 41 percent, within the poll’s 2.7 percent margin of error.
While Clinton takes the largest share of African-American voters, Trump’s numbers are noteworthy because Republican candidates have failed to capture more than 13 percent of the black vote in the state in at least 24 years:
www.wnd.com/2016/08/trumps-black-support-explodes-in-biggest-battleground-state/
"Clinton campaign in ‘panic mode’ over Florida black voters
"Hillary Clinton's campaign is in panic mode. Full panic mode," said Leslie Wimes, a South Florida-based president of the Democratic African-American Women Caucus.
"They have a big problem because they thought Obama and Michelle saying, 'Hey, go vote for Hillary' would do it. But it's not enough," Wimes said, explaining that too much of the black vote in Florida is anti-Trump, rather than pro-Clinton. "In the end, we don't vote against somebody. We vote for somebody."
www.politico.com/story/2016/09/hillary-clinton-florida-black-voters-228822