Answer :
The manipulation may consist of diluting the voting power of the opposing party's supporters or "packing" (concentrating the opposing party's voting power in one district to reduce their voting power in other districts).
Political or partisan gerrymandering, which reduces the voting power of members of ethnic or linguistic minority groups, is the practice of drafting electoral district boundaries in a way that provides one political party an unfair advantage over its rivals (racial gerrymandering). The phrase is derived from the name of Massachusetts Governor Elbridge Gerry, whose government passed a bill designating new state senate districts in 1812. The law concentrated the Federalist Party vote in a small number of districts, giving Democratic-Republicans an unfair advantage in representation. One of these districts was supposed to have a salamander-like shape. Elkanah Tisdale's satirical cartoon "The Gerry-mander," which was published in the Boston Gazette, depicted the neighborhoods as a fantastic animal.
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