Donald Trump Doesn't Know When Black People Got the Right to Vote?

President Donald Trump appears to have suffered from another foot-in-mouth moment with a comment that suggests he has no idea how long African-Americans have had the right to vote in the U.S.

Speaking at a rally in Nashville on Tuesday evening, the president suggested African-Americans had been voting Democrat for more than a century, despite black people facing barriers to voting in America until 1965, when the Voting Rights Act aimed to scrap discrimination in the polling booth.

"African-Americans vote for Democrats, for the most part," Trump said at the rally, Business Insider reported. "Vast majority. They've been doing it for over a hundred years," he added.

Five years after slavery ended, the 15th Amendment, in 1870, technically granted African-Americans the right to vote. It was a right that African-Americans had begun campaigning before even before they were emancipated. What's more, the measure was largely passed by Republicans, not Democrats.

"The right of citizens of the United States to vote shall not be denied or abridged by the United States or by any State on account of race, color, or previous condition of servitude," the amendment stated.

However, the amendment was not carried out in practice, with black suffrage facing numerous barriers, including voting restrictions and requirements such as taxes and literacy tests. Indeed, even those African-Americans who may have been eligible to vote faced social barriers to casting a ballot, with terrorist groups such as the Knights of the White Camelia attempting to prevent the 15th Amendment from being embraced, according to the Department of Justice.

"As a result of these efforts, in the former Confederate states, nearly all black citizens were disenfranchised and removed from by 1910," the Justice Department notes.

As such, the idea of voting rights for African-Americans did not truly take shape until well into the 1960s, with the adoption of the Voting Rights Act.

The president's apparent misunderstanding of history was highlighted in a tweet by NBC News White House Correspondent Geoff Bennett following the rally. "Trump, in Nashville, says African Americans have blindly voted for Democrats "for over a hundred years." If only black folks had the right to vote for that long... " he tweeted.

The tweet prompted an immediate backlash against the president, with a number of social media users questioning why the president appeared unaware that Jim Crow laws largely disfranchised black voters.

Trump is right that black people in the U.S. these days aren't huge supporters of the GOP or his politics. An Associated Press/NORC Center poll in February found 92 percent of blacks disapprove of the Trump White House. Only 7 percent of African-Americans approve of his administration.