The answer is "the length of the school year was determined by the farming culture of the late 1800s."
The term cultural lag is utilized to portray the circumstance in which innovative headways or changes in the public arena happen speedier than the adjustments in the standards and standards of the way of life that accompany those progressions or changes. This can prompt good and moral dilemmas for people as the new social standards are created.
An example of cultural lag today is school calendars, most schools still have a 9-month school year which was initially intended to give kids a chance to be home working in the fields amid the late spring when most families were associated with a farming culture.