Africa's push for local currency payment systems — once little more than an aspiration — is finally making concrete gains, bringing the promise of less costly trade to a continent long hobbled by resource-sapping dollar transactions.

But efforts to move away from the dollar face strong opposition and the threat of retaliation from U.S. President Donald Trump, who is determined to preserve it as the dominant currency for global trade.

The move by Africa to create payments systems that do not rely on the greenback mirrors a push by China to develop financial systems independent of Western institutions. Countries like Russia, which face economic sanctions, are also keen for an alternative to the dollar.