Why did secondary education get more widespread?

The economy directly influenced secondary schools from the time such schools were created. Access to transportation and family economic stability influenced high school enrollment rates, but as jobs required more education, a higher number of students stayed in high school. In the late 1920s, youth unemployment emerged as a contentious political and social issue. Politicians and educators wanted students to remain in high school to reduce increased delinquency, crime, and political radicalization. With millions of youth unemployed during the Great Depression of the 1930s, every attempt was made to keep more students in school. At the same time, budgets were reduced, putting a major strain on most schools. During the 1920s and 1930s, the school curriculum became more custodial in nature to meet the immediate needs of youth. Consequently, the emphasis shifted from academic courses to consumer-oriented classes, and life skills were emphasized.

the answer is the ku klux klan