The sequel took eight years, the equivalent of two presidential terms, but on Tuesday, Joe Biden will host a second US-Africa summit.

Since 2014, China, viewed by Washington as its main long-term challenger, has consistently outpaced the US as the largest investor in Africa and Russia has increasingly flexed its muscle, sending mercenaries to hotspots and trying to rally opinion to blunt Western pressure over Ukraine.

Biden's three-day summit will feature announcements of new US investment and highlight food security, worsened by the invasion of Ukraine, but, unlike China, also focus on values such as democracy and good governance, as well as fighting climate change.

But the biggest message from Biden, a lover of backslapping face-to-face diplomacy, will be that the US cares.

Since defeating Donald Trump, who made no secret of his lack of interest in Africa, Biden threw his support behind an African seat on the Security Council and at the Washington summit would call for the African Union to formally join the Group of 20 major economies, an aide said.

"We believe that this is a decisive decade. The way in which the world will be ordered will be determined in the coming years," said Biden's top Africa advisor, Judd Devermont.

Biden would also announce US support for the African Union's admission to the G20 group of the world's largest economies as a permanent member, Devermont said.

"We need more African voices in international conversations that concern the global economy, democracy and governance, climate change, health and security," Devermont said.

Devermont said the move came after requests from African Union Chair and Senegalese President Macky Sall and South African President Cyril Ramaphosa.

South Africa is the only G20 member from Africa. The AU is made up of 55 member states.

"It’s past time Africa has permanent seats at the table in international organizations and initiatives," Devermont said, adding that the move builds on Washington's strategy for Sub-Saharan Africa.

Biden and Secretary of State Antony Blinken "believe strongly that African voices are going to be critical in this conversation," he said.

African leaders have already been holding summits every three years with China and also have regular meetings with several US allies: France, Britain, Japan and the European Union.

All, almost, welcome

After a row over invitations distracted attention from his Western Hemisphere summit in Los Angeles in June, Biden has been open with the guest list from Africa.

The US is inviting all African Union members in good standing, meaning not Burkina Faso, Guinea, Mali or Sudan, and with which Washington has full relations, which excludes authoritarian Eritrea.

One of the most closely watched leaders expected in Washington will be Ethiopian Prime Minister Abiy Ahmed, a one time US ally whom the Biden administration has accused of backing widespread abuses in the Tigray conflict, which has subsided with a breakthrough Nov. 2 agreement signed in South Africa.

Also in Washington will be the presidents of Rwanda and the Democratic Republic of Congo as Blinken leads international pressure on Rwanda over alleged support to rebels advancing in its giant neighbor.

Other presidents due at the summit include Egypt's Abdel Fattah al-Sisi and Tunisia's Kais Saied, who have both faced criticism on democratic rights, and Equatorial Guinea's Teodoro Obiang Nguema Mbasogo, days after the US called his latest election a sham. The foreign minister of Zimbabwe, which is under US sanctions, is also expected to attend.

"We've taken some criticism, I think it's fair to say, from some who wonder why we invited this government or that government about which there are some concerns," said Molly Phee, the top State Department official for Africa.

"But that reflects the commitment of President Biden and Secretary Blinken to having respectful conversations even where there are areas of difference."

'Robust' debate on trade

One key topic will be the fate of the African Growth and Opportunity Act, the 2000 deal that granted duty-free access to the US market for most products from sub-Saharan nations that meet standards on rights and democracy.

The pact expires in 2025, leading African leaders to seek clarity at a time that the US has soured on trade deals.

"We regret that AGOA trade preferences have not been utilized to the maximum," Phee said.

She expected a "robust discussion" and said the US may look after 2025 to engage instead with a nascent continental free trade area.

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