The 2019 Oscars were a win for films telling stories from a range of racial and cultural perspectives, marking a major shift three years after the movie industry's top awards show was slammed for overlooking work by nonwhite artists.

Green Book, a film about racial injustice in the segregated US South in the 1960s, took best picture, the night's top prize. In his acceptance speech, director Peter Farrelly said the film, about a black pianist and his white driver, was "about loving each other despite our differences".

Green Book won three awards, as did Roma, a black-and-white, Spanish-language film about an indigenous housemaid, and Black Panther, a Marvel superhero movie with an almost entirely black cast. Spike Lee's BlacKkKlansman, about a black detective who goes undercover with the Ku Klux Klan, also was honored.

"It's a real breakthrough that any film about race gets to win," Kevin Willmott, who is African-American and was one of the BlacKkKlansman writers who won an Oscar for the screenplay, said backstage.

"When I first started in the industry, it was really bad. And we’ve come a long way since then."

Mahershala Ali, one of the stars of Green Book, was one of two black actors to claim acting prizes, taking home the best supporting actor trophy. Regina King, who played a protective mother in If Beale Street Could Talk, claimed the supporting actress award.

Rami Malek, whose parents immigrated from Egypt to the United States, took home the best actor prize for his turn as Freddie Mercury in Bohemian Rhapsody. He noted backstage that as a child he felt skeptical about his prospects in Hollywood because of his cultural background.

Read also: Controversial race drama 'Green Book' grabs top prize at Oscars

"I never saw anyone in a lead role that looked like me," he said.

Spike Lee, the acclaimed black director, took home his first Oscar on Sunday, a best adapted screenplay prize for BlacKkKlansman, after a career that has spanned decades and included a famous Oscar loss in 1989 for his film Do The Right Thing.

Backstage, Lee sipped champagne and said he would not have won an Oscar on Sunday had it not been for the #OscarSoWhite campaign that erupted in 2015 and 2016, and for Cheryl Boone Isaacs, the former Academy president who oversaw efforts to diversify its membership.

"They opened up the Academy to make the Academy look more like America," Lee said, noting wins on Sunday by black women including Ruth E. Carter and Hannah Beachler, the costume designer and production designer, respectively, for Black Panther.

Mexico's Alfonso Cuaron, who won the directing, cinematography and foreign film prizes for his film Roma, thanked the Academy in his speech for recognizing a film with a lead character "that has historically been relegated to the background of cinema."

Backstage, however, he noted that Hispanic Americans are "really badly represented still" in film roles.

Also backstage, King noted the broad support she received for her performance, but said of Hollywood that "we're still trying to get more reflective. Still trying to get there."