Read the text and determine if the sentence is true:

The USAC Road Racing Championship was a sports car racing series in the United States held from 1958 until 1962. The series was organized by the United States Auto Club as a fully professional alternative to the Sports Car Club of America's SCCA National Sports Car Championship.

Sentence: The race became unpopular in 1962 and was discontinued due to public protest.
It's impossible to say