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You can find shapefiles from the US census: https://www.census.gov/geographies/mapping-files/time-series/geo/cartographic-boundary.html Shapefiles and kml files are both available for congressional district, counties and other categories used by the census. Some historical data is available from https://www.census.gov/geographies/mapping-files/time-series/...


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The process is spelled out in the Administrative Procedure Act. See, e.g., National Urban League v. Ross and Ohio v. Coggins. Basically, it amounts to a lawsuit against a federal government official in the chain of command involved in making the decision in question filed in a suitable U.S. District Court.


2

The proper way to go about it is detailed by ohwilleke's answer. But for the sake of amusement let's ignore that and consider the fallback: Petition/Pressure/Obstruct Congress Reapportionment due to the Census, while required by the constitution, is not automatic and self-executing by default. It requires an act of Congress to determine both how many seats ...


1

100% turnout, Identical sized districts, Infinite population = 25% minimum. E.g. 1200 voters in 12 districts: 49 blue votes, 51 red votes in 7 districts 100 blue votes in 5 districts Total 843 blue voters, 357 red votes. (29.75% to stay in power) 1.2 million voters in 1200 districts: 499 blue votes, 501 red votes, in 601 districts 1000 blue votes in 599 ...


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