The Economist / YouGov Poll was done between August 12th and 14th of a nationwide sample of 1,500 adults, with a 3 point margin of error.
The CBS News Poll was done between August 8th and 10th of a nationwide sample of 2,238 adults, with a margin of error of 2.5 points.
The Quinnipiac University Poll was done between August 9th and 13th of a nationwide sample of 1,175 voters, with a margin of error of 3.4 points.
As these three polls show, Americans are not happy with the state of race relations currently in this country. They know it's a serious problem that needs to be dealt with. They also know that Donald Trump is not helping. In fact, by displaying his own racism, he's making the problem worse.