President-elect Joe Biden used his victory speech Saturday evening to deliver an emphatic thank-you to the Black voters who overwhelmingly backed him in major cities, helping propel him to victory in crucial swing states like Michigan, Pennsylvania, and Wisconsin.

“Especially at those moments when this campaign was at its lowest ebb, the The African American community stood up again for me,” Biden said, repeatedly slamming his fist on the podium as the crowd erupted in cheers. “You’ve always had my back, and I’ll have yours.”

Black voters, particularly in key cities such as Atlanta, Detroit, Milwaukee, and Philadelphia, were a critical factor in Biden’s success. Exit polls revealed that 87% of Black voters backed Biden compared to just 12% for President Donald Trump, though they also indicated that Trump had improved his standing among Black voters compared to 2016.

Black voters were also invaluable to Biden earlier in the year, awarding him decisive victories in a number of primary contests. On Saturday evening, Biden spoke to an ecstatic drive-in crowd in Wilmington, Delaware, thanking all of his supporters, calling for unity, and praising what he called “the broadest and most diverse coalition in history.”

“I’m proud of the campaign we built and ran. I’m proud of the coalition we put together,” he said. “Democrats, Republicans, independents, progressives, moderates, conservatives, young, old, urban, suburban, rural, gay, straight, transgender, white, Latino, Asian, Native American. I mean it.”