Earlier in the evening, Cardi won her first award for Favorite Rap/Hip-Hop Artist.
BTS has won an award at the 2018 American Music Awards (AMAs)! "Thanks guys, I appreciate it".
It was also a night of firsts for a handful of artists.More news: Sony CEO States Next-Generation Console As 'Necessary', Confirming PS5?
And as always, the ceremony boasted a slew of stellar musical performances.
Elsewhere on Tuesday, New York rapper Cardi B, brought down the house with an exuberant performance of dance hit I Like It with J.Balvin and Bad Bunny. The three turned the stage into a colorful fiesta. Carey performed a new song, "With You", but critics were ready to accuse her of lip synching.More news: Wozniacki wins 30th title with China Open victory
But it was Swift's activism that made the most impact. "The midterm elections on November 6", Swift said after collecting the award for Artist of the Year. "Not just because she's my daughter, but while I was pregnant, I was just so influenced to be like, 'Yo, I gotta do this!' I had to prove people wrong, 'cause they said I wasn't gonna make it after I had a baby".
"[If] you didn't want to hang out with us, we wouldn't have been on an amazingly fun stadium tour", she said.
Taylor Swift kicked off her week with a rare political post on social media, and at the American Music Awards she continued the conversation by encouraging fans to vote in the upcoming midterm elections. It was so chill in fact that Halsey actually had time to tweet from the stage. She believes businesses have a right to refuse service to gay couples. "Wearing my favorite Jordans lol". Gladys Knight, Ledisi, Mary Mary, Donnie McClurkin and CeCe Winans were among the musicians who paid tribute to the Queen of Soul's gospel roots and her iconic album, Amazing Grace.More news: Call of Duty: Black Ops 4 File Size Revealed