What’s gerrymandering?
Gerrymandering is the practice of drawing electoral districts into weird and tortuous shapes in order to minimize the number of total districts that will vote for one party and maximize the number that will vote for the other – for instance, connecting two populous urban areas with a dumbbell shape instead of making them two distinct districts that’d also incorporate some nearby rural land, in order to turn two areas, and thus two votes, that’d vote for Party A into a single area, and thus one vote, that’ll do so. See also
this schematic.
The name comes from the earliest publicized case of this, when the electoral districts in Massachusetts were redrawn into highly suspect shapes under Governor Elbridge Gerry. The resulting contortions and distortions reminded people of salamanders, hence Gerry’s salamander; this was shortened to Gerry-mander and became gerrymandering.
Also are Europeans being overrun from their countries?
No, we’re not. That’s nothing more than the usual anti-immigrant fearmongering from European far-right parties – the same as anti-Mexican fearmongering here.