In Zambia, a country of 14 million people with a GDP of $20 billion, the impact of China has been enormous.
"The Chinese have changed Zambia," said Nelson Mwendabai, a retired civil servant who ticked off Chinese-backed projects: a railway between Tanzania and Zambia, new roads, schools, clinics and stadiums. Mwendabai said: "We should just accept that they are our friends."
Zambian President Michael Sata criticized the Chinese presence as an opposition leader, seeking to harness nationalist unhappiness with Chinese accused of taking jobs from Zambians by engaging in low-pay jobs such as pushing wheelbarrows at construction sites. He changed his tune after his Patriotic Front party won elections in 2011. In April, Sata went to China on an 11-day state visit, soon after new Chinese ruler Xi Jinping took office.
"I have come to say 'thank you' for the work the Chinese are doing in Zambia," Sata told Xi.
Relations between Zambia and China date back to Zambia's independence from British colonial rule in 1964. The real Chinese push begun in the past couple of decades, as China expanded rapidly and sought natural resources to feed its economy. China's accumulated investment in Zambia stands at over $2.5 billion, mostly in mining and metal refining.
Chinese mining of Zambia's copper reserves is an important ingredient in China's industrial production, said Zhou Yuxiao, China's ambassador to Lusaka. Chinese mines are expanding into Zambia's northwest Copperbelt region, where fresh deposits of copper, gemstones, uranium and traces of oil have been located.
Chinese investment is expected to grow even more when industrial parks go into full production in 2015, allowing companies to manufacture and export tax-free goods. All these Chinese activities are being serviced by the Bank of China. China is also helping Zambia overcome electricity shortages by building a $2 billion hydro-electric project, part of which will start operating in December.
The benefits of China's presence, however, are tempered by outbursts of tension and even violence between Chinese managers and many Zambian workers who accuse them of poor pay, bad working conditions and inadequate safety regulations that have cost lives on occasion.
In one incident, four Chinese men involved in the mining industry were accused of paying for sex with minors. A magistrate later ordered them to be freed, saying police had bungled the investigation, but critics speculated that authorities had been bribed to drop the case. Separately, earlier this year, 400 workers working at a Chinese-operated mine complained of ill treatment for being held underground for three hours while an elevator was repaired; managers refused to pay them overtime despite protests from union officials.
Complaints about Chinese business practices in Zambia stretch back years and often are pointed to as examples of problems with Chinese investors across Africa. In 2005, an explosion at a Chinese-owned factory in northern Zambia killed 51 Zambian workers. In 2010 two Chinese managers were accused of shooting coal miners during a labor dispute. Months later, the mine agreed to pay compensation to 13 injured workers, and attempted murder charges against the managers were dropped.
But for Precious Kunda, China is essential. She runs three shops in Lusaka that sell dresses and women's accessories from China and she imports Chinese building materials for sale in Zambia.
Kunda said succintly: "They are cheap."