Minnesota’s standoff with the Trump administration amid its immigration crackdown in the state has made a political tinderbox of the Twin Cities, as devolving clashes between protesters and federal agents stoke fears of a bigger brewing conflict. Local officials have deemed the surge of immigration enforcement officers a “federal invasion,” doubling down in the courts and in public remarks as federal confrontations with Minnesota residents turned violent, then deadly. The fatal shooting of 37-year-old intensive care nurse Alex Pretti brought the standoff to a cliff edge — and both President Trump and the state seem to have changed course.But as...