With the new funding from the State Department and US Agency for International Development, the country is providing emergency food and nutrition assistance to help vulnerable populations through food aid.
Tillerson contrasted the United States' work on the African continent, which he said promoted "sustainable growth", with that of China, which recently pledged US$124 billion (RM484 billion) for its plan to expand links between Asia, Africa, Europe, and other places.
Tillerson had reiterated the importance of democracy for Africa to achieve her potentials.
The benefactors are Nigeria, Ethiopia, Somalia, and South Sudan, as well as countries in the Lake Chad region.
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In a speech Tuesday outlining the Trump administration's Africa policy, Tillerson said the United States is "eager" to lower barriers to trade and investment in Africa, whose largest trading partner by far is China.
China is aggressively working to expand its regional influence, which is something of concern to US lawmakers.
Of the newly-announced funds, almost $184 million is for affected populations in South Sudan and more than $110 million is for millions vulnerable in Ethiopia.
His announcement of more humanitarian assistance for several countries threatened by starvation will be welcomed, but Tillerson works for a president who has repeatedly spoken of reducing America's burdens overseas.
Tillerson said: "today I'm announcing $533 million in additional humanitarian assistance to fight starvation and food insecurity and address other needs resulting from conflicts in Somalia, South Sudan, Ethiopia, and the Lake Chad Basin". Another $110 million was destined for Ethiopia to help amid a drought. "That includes freedoms of expression and association, an independent press, a robust and engaged civil society, a government that is transparent and accountable to all of its citizens, and a fair and impartial judiciary", explained Tillerson to African representatives in Washington.