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

VOA: special.2010.02.04

"By two thousand and twenty, C.O.P.D.will likely be the third leading cause of death across the world."

VOA: special.2009.06.23

And identifying the cause of the pain can be difficult, especially for untrained doctors.

VOA: special.2011.07.26

And though I now sink out of view and shall be forgotten, I believe I have made some marks which will tell for the cause of civil liberty long after I have gone."

VOA: special.2009.06.11

But most important is finding the cause of the disease so it can be prevented or cured.

VOA: standard.2010.08.09

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