In 1975, Angola was tumbling into pandemonium; everyone who could was packing crates, desperate to abandon the beleaguered colony. With his trademark bravura, Ryszard Kapuscinski went the other way, begging his was from Lisbon and comfort to Luanda--once famed as Africa's Rio de Janeiro--and chaos.Angola, a slave colony later given over to mining and plantations, was a promised land for generations of poor Portuguese. It had belonged to Portugal since...