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According to the article, Federalism means:
Federalism is the constitutional division of powers between the national and state governments.
James Madison, "the father of the Constitution," explained it this way: "The powers delegated to the federal government are few and defined. Those which are to remain in the state governments are numerous and indefinite. The former will be exercised principally on external objects, [such] as war, peace, negotiation, and foreign commerce. The powers reserved to the several states will extend to all the objects which, in the ordinary course of affairs, concern the lives, liberties, and properties of the people." And Thomas Jefferson emphasized that the states are not "subordinate" to the national government, but rather the two are "coordinate departments of one simple and integral whole.
Since governments tend to overstep the bounds of their authority, the founders knew it would be difficult to maintain a balanced federalism. In fact, that was one of the central issues raised by the state ratifying conventions as they met to decide whether to approve the new Constitution.
a. The national government has total power over the states
b. The national and state governments share power
b.The national and state governments share power