George Bush met Mr dos Santos this week and urged him to end the war.

ECONOMIST: This is Angola's best chance for peace for a decade

The No. 1 wealth-producing industry: Investments, which made 148 billionaires including George Soros, Carl Icahn and newcomers Seth Klarman and Isabel dos Santos.

FORBES: How The World's Billionaires Get Rich

In fact, the No. 1 wealth-producing industry is Investments, where 148 billionaires including George Soros, Carl Icahn and newcomers Seth Klarman and Isabel dos Santos derive their wealth.

FORBES: Price To Check The Portfolio of Buffett, Icahn And Other Billionaires: $4.99 Per Year