The West may collapse very suddenly. Complex civilizations do that, because they operate, most of the time, on the edge of chaos. - Niall Ferguson

To Livingstone, the search for a way to open up Africa to Christianity and civilization was made still more urgent by the discovery that slavery was still thriving. Though the slave trade in the west of the continent had supposedly been suppressed following the British abolition law, slaves continue to be exported from Central and East Africa to Arabia, Persia and India. Perhaps as many as two million Africans fell victim to this eastward traffic in the course of the nineteenth century.

The rulers of western Africa prior to the European empires were not running some kind of scout camp. They were engaged in the slave trade. They showed zero sign of developing the country's economic resources. Did ultimately benefit from French rule? Yes, it's clear. And the counterfactual idea that somehow the indigenous rulers would have been more successful in economic development doesn't have any credibility at all.

With its weird red earth and its alien flora and fauna – the eucalyptus trees and kangaroos – Australia was the eighteenth-century equivalent of Mars. This helps explain why the first official response to the discovery of New South Wales by Captain Cook in 1770 was to identify it as the ideal dumping ground for criminals.