WASHINGTON — The U.S. Department of Justice civil rights division was created in 1957 with an initial focus on combating racial inequality and protecting voting rights.But in the first two years of President Trump’s second term, its mission has been reimagined.Now, the division is focused on combating diversity initiatives, rolling back pro-transgender policies and rooting out allegations of election fraud.It had for decades investigated police departments for using excessive force. Now it investigates police departments with excessive delays in approving gun permits.California has served as the division’s laboratory for all of these changes, or, as one former civil rights staffer put it,...