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A wikipedia search gave me the following information: Competition from television drew audiences away from movie theaters in the late 1950s, and the theatrical cartoon began its decline. Today, animated cartoons are produced mostly for television. American television animation of the 1950s featured quite limited animation styles, highlighted by the work of Jay Ward on Crusader Rabbit. Chuck Jones coined the term "illustrated radio" to refer to the shoddy style of most television cartoons that depended more on their soundtracks than visuals. Other notable 1950s programs include UPA's Gerald McBoing Boing, Hanna-Barbera's Huckleberry Hound and Quick Draw McGraw, and rebroadcast of many...
Full answer by Mistu4u: https://movies.stackexchange.com/a/8927 (CC BY-SA 3.0).
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