In some areas of the country the school systems do develop system calendars based on the businesses and habits of the those living in that state (some would claim this is actually a monetary reason first and foremost, while others would argue it is mutual reasoning). In some of the northeast states, the calendar is sometimes developed in a school system with this in mind, as the businesses (ski industry) and habits of those living there are a strong part of their lives (and financial stability). Just like in Maryland, where the Governor just passed a law prohibiting schools from starting before Labor Day. The main objective was to extend the vacation season for their East Coast (Ocean City as the locals know it), essentially allowing the youth of the area to continue to work their for an extra two weeks, and families to have an extra 2 weeks to vacation (this is a new law just passed). I am not saying I agree with such decisions when it comes to school calendars, just pointing out that these things are decided by respective school systems (or in the case of Maryland, forced upon them by the government).