Chinese companies have muscled in on lucrative oil markets in places like Angola, Nigeria, Algeria, and Sudan. But oil is neither the largest nor the fastest-growing part of the story. Chinese firms are striking giant mining deals in places like Zambia and the Democratic Republic of the Congo, and building what is being touted as the world’s largest iron mine in Gabon. They are prospecting for land on which to build huge agribusinesses. And to get these minerals and crops to market, they are building major new ports and thousands of miles of highway.