Please describe the evolution of federalism in the United States from the foundi

Please describe the evolution of federalism in the United States from the founding until today. How is the conception of federalism today different than it was at the founding? Please cite the readings. 500 words minimum.
How do state / local governments have an influence over the Federal government and how does the Federal government have an influence over state/local governments? Please cite the readings. 500 words minimum.