the us and state government don't control it.
counties and sometimes individual cities (if they have their own school system) do.
so for Disney it starts mid-Feb and goes to end of April - although in someplaces it includes the first week in May.
now in Al (my state) is actually trying to control when the schedule starts and stops - for the southern counties - who claim schools going back in early Aug are hurting their business.
that say the place with money (with the exception on Mobile county) - want the school board to control this issue. right now the law is what the southern counties want - but there were several bills to stick it. (another thing Ala is famous for - changing something then spending money, time and resources to change it back - this bill should never have past in the first place)