Richard McElrath and his sister, Natheley McElrath, at a community forum in West Charlotte, N.C. (Photo by Michael Falco) RACE AND IMMIGRATION Pressed by a New Invasion of Yankees, Schools of the New South Resegregate BY Jonathan Tilove CHARLOTTE, N.C. -- Jane Henderson's voice trembled as she implored the school board not to let Charlotte-Mecklenburg's schools resegregate any more than they already have. Jack Heilpern, wife Mary, son James, 17, and daughter Jennifer (on stairs), 12, in the foyer of their Huntersville, N.C., home. James, a high school junior, and a fellow student started a movement...