After doing a little research I found these two articles on this. Every state redraws its electoral districts, determining which people will be represented by each politician. In many states, this means that politicians gather behind computer screens to figure out how they can manipulate the lines to box out their competition and maximize the power of their political party. While an increasing number of states employ independent commissions to draw district lines, the large majority still lack safeguards to prevent partisan favoritism in the redistricting process—also known as partisan gerrymandering.