By Mandy Mclaren, The Washington Post VACHERIE, La. – At the new public charter school in this Mississippi River town, nearly all students are African-American. Parents seem unconcerned about that. They just hope their children will get a better education. “I wanted my girls to soar higher,” said Alfreda Cooper, who is black and has two daughters at Greater Grace Charter Academy. Three hours up the road, students at Delta Charter School in Concordia Parish are overwhelmingly white, even though the surrounding community is far more mixed. As the charter school movement accelerates across the country, a critical question remains unanswered – whether the creation of charters is accelerating school segregation.