The economic evidence that they were right, building since the start of the new century, now seems incontrovertible. In the ten years from 2000 to 2010, six of the world's ten fastest-growing countries were in sub-Saharan Africa: Angola, Nigeria, Ethiopia, Chad, Mozambique, and Rwanda. In eight of the past ten years, sub-Saharan Africa has grown faster than Asia, according to The Economist. In 2012, the International Monetary Fund expects Africa to grow at a rate of 6%, about the same as Asia.

Ten years ago, development was synonymous with disappointment for Africa watchers, to paraphrase the chapter in Frederick Cooper's classic survey, "Africa Since 1940." The decades following de-colonization in the late 1950s and early 1960s saw metrics in economics, health, and well-being decline almost across the board. Writing in 2002, Cooper observed, "No word captures the hopes and ambitions of African leaders, its educated populations and many of its farmers and workers ... better than development." Yet "development and disappointment," Cooper concluded, went hand in hand as the development strategies of African governments, and the foreign-assistance strategies of the international community, proved ineffective and, to some critics, even retarded African development.

What changed? Partly, the boom in commodities. Sky-high copper prices have lifted copper-rich Zambia. Record cocoa prices are bringing $2 billion annually into Ghana. Kenyan farmers, mostly small, are responsible for $1 billion in annual exports of fruits, vegetables, and flowers, a figure that dwarfs the country's traditional coffee and tea exports. And, of course, high demand for oil and gas has helped a number of countries enormously. But even countries without such natural resources, such as Rwanda, have seen significant gains, mostly because of improved economic governance and the return of money and skills from Africans who left their countries during the dog days. Rwanda, for instance, long an importer of food, now grows enough to satisfying the needs of its people, and even exports cash crops such as coffee for the first time.

Technology also plays an important part in the new African boom. Probably the most astonishing development success since 2000 in Africa has been the communications revolution. A dozen years ago, merely making a phone call (or receiving one) was virtually impossible even in Africa's most important commercial centers. An elite business person might hire two or three people fulltime simply to repeatedly dial phone numbers over the crumbling, puny, and perversely sub-optimal government-owned telephone systems. Nigeria, at the time a country of 100 million people, had at most 100,000 working dial tones. It was not remarkable for one call out of every 50 made to be completed. Naturally, the effect on productivity was devastating, but equally as bad was the sense of isolation. Everything had to be done face to face, consigning people to long trips for even trivial maneuvers. Waiting became a way of life.