18 янв 1890 г. - Progressive School Era

Описание:

The Progressive School Era began in the 1890s and reached its peak in the 1930s. This era saw a large expansion in the number of schools and number of students being served. Because of more schools and the shift towards student centered learning, 50% of young adults had a high school diploma by 1940.
https://www.k12academics.com/history-education-united-states/progressive-era