Not Possible in This Dimension
Maybe I'm missing some very small but incredibly powerful wrinkle in the logic here, but it seems to me that by definition forcing local districts to use national standards must threaten local control. Indeed, it must not only threaten it, it must actually defeat it. And this is in no way changed by the curriculum having to account for "only about half" of a school's time: Hours formerly controlled locally are now controlled nationally, which is inescapably a major incursion on local control.
Maybe in some dimension white is black, black is white, and ants are really walruses. But in this dimension, as far as I know, the laws of reality and logic must still apply -- even to national curriculum standards.
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