Djibouti - The new electrified rail line snakes through the African desert, charting a course from a port along the Djibouti coast to Addis Ababa, the capital of land-locked Ethiopia.
The Chinese built the railway, and part of the port, and the new military base next door. On the other end of the line, Chinese dollars financed Addis Ababa's new light rail, and the new ring road system, and the silver African Union headquarters that towers over the city.
Across the Atlantic Ocean, America has noticed.
From Djibouti to Ethiopia, Kenya to Egypt, the United States is sounding the alarm that the Chinese money flooding Africa comes with significant strings attached. The warnings carry distinct neocolonial undertones: With Beijing's astonishing investments in ports, roads and railways, the US says, come dependency, exploitation and intrusion on nations' basic sovereignty.
"We are not in any way attempting to keep Chinese investment dollars out of Africa. They are badly needed," US Secretary of State Rex Tillerson said this week in the Ethiopian capital. "However, we think it's important that African countries carefully consider the terms."
Those terms lead to deals in which Chinese workers, not Africans, get the construction jobs, Tillerson and other US officials warn. They say Chinese firms, unlike American ones, don't abide by anti-bribery laws, fueling Africa's pervasive problems with corruption. And if countries run into financial trouble, they often lose control over their own infrastructure by defaulting to a lender that historically has not always been forgiving.
Some African countries now owe sums double that of their annual economic output, the US has said, with most debt owed to China. In Djibouti, the debt totals roughly 84% of its GDP, Foreign Minister Mahamoud Ali Youssouf acknowledged on Friday.
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"We are not that worried," Youssouf said, standing next to Tillerson as the top US diplomat visited the tiny coastal country. "No country can develop itself without having a strong infrastructure. And China is, from that perspective, a very good partner."
There are obvious reasons why the United States would want to cast itself and its companies as a more favorable alternative to China, the geopolitical rival and economic competitor whose influence is also on the rise in Latin America, Europe and the Middle East.
But there's a problem, African politicians and economists say: China, unlike the United States, is showing up on the continent with a generous checkbook in hand. Given the unpredictability involved in investing in poorer countries, China is often the only one willing to take the risk.
And African nations realise that China's investments don't come with the same nagging about human rights and good governance that often accompanies US assistance.
"They're ready to basically do business," said Brahima Coulibaly, a former Federal Reserve economist and Africa scholar at the Brookings Institution. "They're ready to partner with any country that is also willing to partner with them in a way that it makes sense to them and furthers their agenda."
China vehemently disputes that its enterprises in Africa or elsewhere are exploitive, arguing instead that its generosity illustrates its commitment to the rest of the world's economic and social development.
"No one dominates, and all parties participate on an equal footing," Chinese Foreign Minister Wang Yi said in his annual news conference on Thursday. "There is no secret operation, but an open and transparent operation - no 'winner-take-all,' but all see mutual benefits and 'win-win' results."
The eye-popping investments through China's "One Belt, One Road" initiative, believed to run into the trillions of dollars, form just one part of the Asian power's bid to promote a new global system that puts Beijing at the centre. Equally alarming to the US are China's military designs.
In Djibouti, China has built its first overseas base along the key shipping route that links Europe and Asia. Its "string of pearls" plan calls for building a network of ports stretching from China to the Persian Gulf. Beijing has also been busy building artificial islands and then taking steps toward militarizing them in a bid to expand its control over waters far from its coast.
China's new base in Djibouti, another country immensely indebted to Beijing, is just miles away from the only permanent US military base in Africa. Though it's China's only African base so far, General Thomas Waldhauser, head of US Africa Command, predicted this week that "there will be more."
"We are not naive to think that some of the activities the Chinese are doing in terms of counterintelligence there - they are taking place," Waldhauser told the House Armed Services Committee. "But it just means that we have to be cautious, we have to be on guard."
For better or worse, US suspicions about China's ambitions are playing out far beyond the confines of Africa. Chinese companies are building or financing power plants in Pakistan and Kyrgyzstan, managing a port in Greece and launching railway projects in Thailand and Tajikistan, with aggressive plans to continue its expansion into Latin America.
Already, there are cautionary tales, critics say.
In Sri Lanka, the former president suffered a surprise election defeat in 2015 after his opponent criticised him for running up some $5bn in debt to China to fund construction. In December, Sri Lanka's government sold an 80% stake in the port in Hambantota to a Chinese state-owned company after falling behind in repaying $1.5bn borrowed to build it.
In Africa, some of the China-funded roads have started to crumble, the US has said, due to shoddy construction. And in January, the French newspaper Le Monde reported that China planted listening devices in the $200m headquarters it built for the African Union in 2012. China denies that claim.