By Steven Malanga, includes “… the schism was already evident in the increasing number of state and local officials enacting laws and policies that ban travel and restrict commerce with other American places with governments they object to—a trend that the Covid-19 emergency has only deepened. In everything from tax policy to travel to contracting rules, a secession movement within the states has been building for years. … The power of the Commerce Clause is fading in other troubling ways.”