When did high school education
become more widespread in the
United States?

The high school movement is a term used in educational history literature to describe the era from 1910 to 1940 during which secondary schools sprouted across the United States. During this early part of the 20th century, American youth entered high schools at a rapid rate, mainly due to the building of new schools, and acquired skills "for life" rather than "for college."

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i have no idea lets guess a

explanation:

answer; /// i believe that the correct answer is (d)the huang he river valley;