ISSUE. Under the U.S. federalist system, governing responsibility is allocated between the federal and state governments. The Affordable Care Act (ACA), which expanded Americans' coverage options, among other health system changes, reflects this structure. While the federal government provides most of the financing for subsidized coverage and sets a federal floor for insurance market regulations, states have flexibility to implement the law. Current health reform proposals from the political right aim to give greater responsibility to states; proposals from the left expand the federal role. GOALS. To review the federal--state governance balance regarding health care, assess how Republican and Democratic proposals might alter that balance, and assess the potential impact on insurance coverage and access to care. METHODS. Evaluation of federal and state governing responsibilities under the ACA and in emerging reform proposals, along with assessment of regional differences in coverage and access using state-level federal data. KEY FINDINGS AND CONCLUSIONS. The ACA's blend of federal standards and subsidies combined with state regulatory authority significantly improved coverage and access nationally and narrowed regional differences. However, the law's federalist structure, established in statute and altered through regulations and court decisions, resulted in disparities in coverage and access across states. These differences would likely widen under proposals that expand state authority and narrow under those that reduce it.
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