A strike last week by some 29,000 teachers in Chicago pushed long-simmering tensions over deeply divisive school improvement ideas--including changes in teacher evaluation and the takeover or closure of underperforming schools--into the national spotlight. A framework for a tentative agreement emerged last Friday, and the union's house of…

In 1954, when the U.S. Supreme Court handed down its decision in "Brown v. Board of Education of Topeka," the South Lawndale neighborhood on Chicago's southwest side was home primarily to Polish and Czech immigrants. In the decades since, South Lawndale has undergone dramatic change. Eastern Europeans moved out, and people of Mexican…