An accelerating exodus of American-born blacks, coupled with slight declines in birthrates and a slowing influx of Caribbean and African immigrants, have produced a decline in New York City's black population for the first time since the draft riots during the Civil War, according to preliminary census estimates. An analysis of the latest figures, which show the city with 30,000 fewer black residents in 2004 than in 2000, also revealed stark contrasts in the migration patterns of blacks and whites. While white New Yorkers are still more likely than blacks to leave the city, they are also more likely to...