American policies have been characterized since their inception by a system of federalism (between the states and the federal government) and checks and balances (among the legislative, executive, and judicial branches), which were designed to prevent any faction, region, or government organ from becoming too powerful. Some proponents of the theory of American exceptionalism argue that the system and the accompanying distrust of concentrated power prevent the United States from suffering a "tyranny of the majority," preserve a free republican democracy, and allow citizens to live in a locality whose laws reflect those voters' values. A consequence of the political system is that laws can vary widely across the country. Critics of American exceptionalism maintain that the system merely replaces the power of the federal majority over states with power by the states over local entities. On the balance, the American political system arguably allows for more local dominance but prevents more domestic dominance than a more unitary system would.