What role did Horace Mann play in its development?

Horace Mann was a pivotal figure in the development of the American public education system in the 19th century. As the first secretary of the Massachusetts Board of Education, he advocated for universal public education, emphasizing the need for trained teachers and standardized curriculum. Mann believed that education was essential for democracy and social equity, and he worked tirelessly to promote reforms that would make schooling accessible to all children, regardless of their background. His efforts laid the groundwork for the establishment of public school systems across the United States.