State-federal relations continue to be buffeted by the increasing polarization between political parties that often accentuates intergovernmental conflict. The hoary antebellum doctrine of nullification also has risen from the dead to point to a future of more state-federal conflict as states controlled by one party, whether Democratic or Republican, enact policies contravening federal laws and judicial rulings. Nevertheless, coercive federalism continues its now 45-year-old onward march as federal power penetrates deeper into state and local authority.
Kincaid, J. (2013) "State-federal relations: Back to the future?" Book of the States, 2013. Lexington, KY: The Council of State Governments, pp. 21-30.