I've always seen compulsory school-attendance as a the worst denial of liberty by the US government; even the draft at least only applies to adults, however compulsory attendance specifically targets children who are both vulnerable and impressionalbe-- which is the REASON they are targeted, since children lack the power, know-how and ability to fight back (which is also the reason that mainly only the youngest
adults are drafted).
As such, compulsory-attendance was clearly the hallmark of statism around the United States, taking place soon after the Civil War.
While it was initiated in the state of Massachussets shortly prior, such was not accepted until long after. From http://www.naturalchild.com/guest/john_gatto.html
"Our form of compulsory schooling is an invention of the state of Massachusetts around 1850. It was resisted - sometimes with guns - by an estimated eighty per cent of the Massachusetts population, the last outpost in Barnstable on Cape Cod not surrendering its children until the 1880's when the area was seized by militia and children marched to school under guard."
It stands to reason, that compulsory school-attendance-- particularly the mass-indoctrination method initiated under Horace Mann in the 1890's-- was the "creeping doom" of individual freedom, which succeeded the Civil War destruction of STATE freedom; once the proverbial "noose" of statism was secured at Appomattox, it was only a matter of time before it "tightened."
Soon afterward, the US Supreme Court upheld the constitutionality of compulsory attendance-- much as it upheld the constitutionality of the draft, i.e. using collectivist and statist logic.
Compulsory school-attendance is the mainstay by which public schools are maintained, via providing a captive audience to fund it. Without the such laws-- and the herd-mentality acceptance thereof-- few parents would vote to continue financing of a system which provides less benefit than a private one of equal cost.
However, without state soveriegnty, the people are at the mercy of the US Supreme Court (or its lesser minions)-- even up to being conscripted to fight in illegal foreign wars.
And for the record: many states-- such as Missouri-- do NOT allow home-schooling.