On January 20, Brookings hosted a briefing to review how redistricting in the 50 states will unfold in the months ahead and present a number of state-based initiatives designed to increase transparency and public participation in redistricting. Brookings Nonresident Senior Fellows Micah Altman and Michael McDonald unveiled open source mapping software which enables users to create and submit their own plans, based on current census and historical election data, to redistricting authorities and to disseminate them widely.