Where states stand in the battle for partisan advantage in US House redistricting maps

Efforts to redraw U.S. House districts for partisan advantage are spreading to more states ahead of next year’s elections.

Missouri on Friday became the third state where lawmakers have approved new congressional districts since President Donald Trump began pushing for mid-decade redistricting.

The trend began in Texas, where the Republican-led Legislature passed a plan backed by Trump. California Democrats responded with their own map to help their party, though it still requires voter approval.

Redistricting typically occurs once a decade, immediately after a census. But in some states, there is no prohibition on a mid-cycle map makeover. The U.S. Supreme Court also has said there is no federal prohibition on political gerrymandering, in which districts are intentionally drawn to one