Since the 1960s, teachers unions across the United States have used strikes or the threat of strikes to influence the terms of collective bargaining agreements with local school districts. In the spring of 2018, teachers in West Virginia, Oklahoma, Arizona, and elsewhere changed their tack, staging walkouts designed to secure salary hikes and…

Teachers unions have had a "muscular" presence in some states, but in others, especially in the South and Southwest, the unions have held little power in recent decades, and the growing dominance of conservative Republicans in state legislatures and statehouses was creating a hostile environment with right-to-work (RTW) laws. The…