The system helped cause the South to be the poorest part of the United States for many years.

VOA: special.2010.02.04

Russian Railways president, Vladimir Yakunin, says that the cause of the derailment has yet to be determined, but sabotage has not been ruled out.

VOA: standard.2009.11.27

The report calls for stronger steps to be taken by advanced economies to reduce carbon emissions, seen as the main cause of global warming.

VOA: standard.2009.09.01

While medical examiners have not yet released the cause of his death, Munganga wonders if it might be linked somehow to Jackson's many plastic surgeries.

VOA: standard.2009.06.28