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The term "federalism" is also used to describe a system of government in which sovereignty is constitutionally divided between a central governing authority and constituent political units (such as states or provinces).
Federalism is the political system where power is shared between the national government and smaller political units. The national government and smaller units are bound together by a political covenant.
The United States federal executive departments are among the oldest primary units of the executive branch of the federal government of the United States-the Departments of State, War, and the Treasury all being established within a few weeks of each other in 1789. In that sense they are the traditional units of federal administration.
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According to the United States Energy Information Administration (EIA) in 2011, total energy consumption in the United States was 97.7 quadrillion British Thermal Units (Btu). Of this, 6.8 quadrillion Btu or 7.0% was from renewable sources, 0.67 quadrillion Btu or 0.69% was from Biofuels, and 8.3 quadrillion Btu or 8.5% was from Nuclear sources. The balance of 83.81% came from fossil fuels.