What did Horace Mann try to change in the United States?

answer:

Horace Mann (1796-1859)

When he was elected to act as Secretary of the newly-created Massachusetts Board of Education in 1837, he used his position to enact major educational reform. He spearheaded the Common School Movement, ensuring that every child could receive a basic education funded by local taxes.

Explanation:

in the 1950s, country music came into its own before rock-n-roll took off in the 60s while jazz and classical music continued to innovate