Final answer:
Cooperative federalism is a style of federalism where both levels of government work together to solve national problems, resulting in a blending of functions and powers, eroding the jurisdictional boundaries between states and the federal government.
Step-by-step explanation:
Cooperative federalism is a style of federalism in which both levels of government coordinate their actions to solve national problems, leading to the blending of layers as in a marble cake. Under this model, the jurisdictional boundaries between the states and the national government are eroded, resulting in a blending of functions and powers. This era of cooperative federalism contributed to the gradual incursion of national authority into the jurisdictional domain of the states, as well as the expansion of the national government's power in concurrent policy areas.