Federalism divides power between the national and state governments. While states were originally more powerful due to large distances between them, the national government has gained power over time through expansive interpretations of its implied and commerce powers, as well as responding to issues like the Civil War, racial equality, and interstate commerce. However, states still play an important role in policymaking through cooperative federalism programs and the grant system, though mandates can infringe on state autonomy. Overall, the national government has expanded its scope but states remain powerful, especially in areas like education and family policy not addressed in the Constitution.