A group of business leaders led Secretary of State Hillary Clinton and the U.S. Chamber of Commerce is in South Africa for three days to explore investment opportunities. The group, which includes senior executives from Boeing, Electro-Motive Diesel Inc. (the diesel-electric locomotive manufacturing subsidiary of Caterpillar), FedEx Express, Walmart and General Electric, participated Monday in a U.S.-South Africa Business Summit in Johannesburg. Clinton is meeting...