The reason why farmers created federalism is because they believed that the government power posed a threat to individual liberty,the exercise of governmental power must be restrained and that to divide governmental power is to prevent its abuse.
I'm not terrific at history, but I believe it was because the Americans were fresh troops and they weren't worn down by years of trench warfare.
So we don't repeat our past, learn about past cultures, learn about families that lived long ago, etc