This week marks a flashpoint in an escalating and unprecedented fight over redistricting, with the country’s two most populous states taking center stage and control of the US House during the second half of President Donald Trump’s term potentially at stake.

RCP senior elections analyst Sean Trende, who advised Virginia's post-2020 redistricting, said Democrats may regret redrawing California's maps in response to a controversial move from Texas Republicans. With many blue states already "maximal gerrymanders," Trende explained how the GOP has a lot...