The Union Map of School Closings – City Journal

"The data can be framed in various ways, but one significant factor is that in places where teachers’ unions are the strongest, schools have been closed the longest. No wonder, then, that for the second straight year, public schools appear to be losing students and, according to a new survey, parents are increasingly embracing school choice...Systems shut down for days or weeks across the country, led by Chicago, where teachers walked out for five days in January, refusing to teach in person."