Image copyright Sogeti Image caption Tourism has been the biggest source of economic growth in some African nations
Some 10,000 US tourists are returning to Sudan every week, the US’s embassy says.
A UK study published in February said 14% of Sudanese travel to the US to visit their relatives and friends.
The use of private jets also rose from 23% in 2014 to almost 50% in 2018, the same study found.
Meanwhile, South Africa said its President Cyril Ramaphosa would urge American businesses to invest more.
Speaking to business leaders in Cape Town, Mr Ramaphosa said he would share South Africa’s expertise in enabling businesses to export their products and services to the US.
Image copyright Johannes Hatzis/DNB Image caption President Ramaphosa will also stress the importance of cross-border investments
Foreign investors were hungry for “getting out of the stagnant US economy”, Mr Ramaphosa said.
South Africa ranked near the bottom of 28 African countries for ease of doing business in the World Bank’s 2019 Doing Business Report.
The index showed that local, foreign and cross-border investments in the country fell between 2016 and 2017 to a record low.
Fears in the aftermath of the 1994 end of apartheid also continued to dampen investor interest, he said.
However, former US President Bill Clinton, in a speech at the World Economic Forum in Cape Town last week, said the country’s democracy was not at risk.
Speaking to the BBC, Trade Minister Rob Davies said: “South Africa is in a well established position in the world.”
“We’ve been open to trade for more than 100 years,” he said.
Image copyright Johannes Hatzis/DNB Image caption US President Donald Trump has criticised Obama for supposedly allowing Iran to rebuild after the lifting of sanctions
Economic experts have said the country is standing on a shaky economic path after the majority of export revenues were directed towards renewable energy.
Africa currently attracts no US investments.
Last month, South Africa’s trade minister imposed a one-year ban on truckers joining SADC from South Sudan because it had not fulfilled obligations on road safety.
Fears have been raised that the industrial unrest will spread to SADC.
It comes as US President Donald Trump has criticised President Barack Obama for allegedly allowing Iran to rebuild after the lifting of sanctions.
Iran is one of eight US allies, known as the “P5+1” nations, who negotiated the 2015 nuclear deal with Iran.