What TV production company dominated American television animation for three decades in the mid-to-late 20th century?

Hanna-Barbera Productions, Inc. (simply known as Hanna-Barbera and also referred to as H-B Enterprises, H-B Production Company and Hanna-Barbera Cartoons) was an American animation studio that dominated American television animation for three decades in the mid-to-late 20th century. It was founded in 1957 by former Metro-Goldwyn-Mayer animation directors William Hanna and Joseph Barbera (creators of Tom and Jerry) and live-action director George Sidney in partnership with Screen Gems, the television arm of Columbia Pictures. Sold to Taft Broadcasting in late 1966, it spent two decades as its subsidiary.

Hanna-Barbera is known for creating a wide variety of popular animated characters. Over 30 years, successful hit cartoons were produced, including The Flintstones, Yogi Bear, The Jetsons, Wacky Races, Scooby-Doo and The Smurfs. For their achievements, Hanna and Barbera together won seven Academy Awards, eight Emmy Awards, a Golden Globe Award and a star on the Hollywood Walk of Fame.

As of 2016, the studio exists as an in-name-only unit used to market properties and productions associated with the Hanna-Barbera library, specifically its "classic" works. In 2005, the Academy of Television Arts & Sciences honored Hanna and Barbera with a bronze wall sculpture of themselves and their characters.