National standards. When the Constitution was written, you had 13 states, spread out along the Atlantic coastline, from Maine to the Carolinas. The weather, farming conditions, flora and fauna, all differently greatly from state to state.
What you needed to learn to be a farmer in Maine, was quite different to what you needed to know to be a farmer in Georgia. Given that people were born, lived and died within a 50 mile radius, education needed to be local.
Today, the USA is no longer an agrarian economy, and EVERYONE needs to the same basic education = reading, writing and history, and you need national standards throughout the country. Your public school education system is under assault by the red states.
Why do Republicans support everything that makes Americans fatter, dumber, and less capable.