My viewpoint however, is that if we have 50 different systems, the best ideas will become apparent, and those states which didn't implement them initially can copy them soon thereafter. The crucible of ideas gets tested and compared to many others. The best ones survive. When we all simply obey the over-reaching and all-encompassing ideas from DC (which are often the worst kind of feel-good pap, like Common Core), we do not get to see what other ideas may bring. There is no comparison. It is simply a total failure, with no hope of competition for improvement.
And, not surprisingly, the Fed were mostly not involved in education, until Jimmy Carter created the Dept of Education in 1979.