The process known as redistricting in the United States and redistribution in many Commonwealth countries is the changing of political borders. Often this means changing electoral district and constituency boundaries, usually in response to periodic census results. This takes place by law or constitution at least every decade in most representative democracy systems to prevent geographic malapportionment.
Each state has its own standards for creating Congressional and legislative districts. In the states where the legislature (or another body where a partisian majority is possible such as IL, OH, TX) is in charge of redistricting, the possibility of gerrymandering (the deliberate manipulation of political boundaries for electoral advantage, usually of incumbents or a specific political party) often makes the process very politically contentious, especially when the two houses of the legislature, or the legislature and the governor, are from different parties. The state and federal court systems are often involved in resolving disputes over Congressional and legislative redistricting when gridlock prevents redistricting in a timely manner. In addition, the losers to an adopted redistricting plan often challenge it in state and federal courts. Justice Department approval (which is known as preclearence) is required in many states that have had a history of racial gerrymandering.
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