The school calendar is based largely on the agrarian demands of the 1800s, when children were needed to help work the family farm during growing season. It has remained fairly constant over the years and attempts to alter it meet controversy.

Despite the resistance to change, 16 states currently have a specific policy allowing year-round schools and 34 states have districts with year-round schools. There are more than 2.3 million students attending one of the more than 3,100 year-round schools nationally.

Thirty-four states require 180 days of school a year, ...

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