The extraordinary range of African-American migrations - from the earliest Africans who arrived to the recent movement of blacks back to the South - is the focus of a new Web site and an exhibition of recent research that could redefine African-American history, said scholars involved with the project, which was announced yesterday at the Schomburg Center for Research in Black Culture in Harlem. "In Motion: The African-American Migration Experience," a three-year project that cost $2.4 million, is probably the largest single documentation of the migrations of all people of African ancestry in North America, said Howard Dodson, director of...