Every decade, after each United States census, states engage in redistricting, the redrawing of congressional and state legislative boundaries. This process often becomes politicized, with district lines drawn to create partisan advantages and disadvantages – a tactic known as gerrymandering. What’s at stake now: control of the House of Representatives. Which criteria should matter most when drawing district lines? What are the electoral consequences when politicians draw lines based on political or racial demographics? Examine interactive resources to explore how changing district lines can affect the balance of partisan power, and evaluate criteria for drawing district lines.