Chicago teachers are in their third and final day of a cross-city march against school closures in low-income communities. The Chicago Teachers Union launched the more than 30-mile trek on Saturday, calling it “Our City. Our Schools. Our Voice.” They are protesting Mayor Rahm Emanuel’s plan to shutter 54 public schools, mostly in African-American neighborhoods. Some 30,000 students will be impacted. A coalition of parents filed two federal lawsuits seeking to stop the closures last week. The board of the Chicago Public Schools is slated to vote on the plan Wednesday.