KIGALI, Rwanda (CNN) -- President Bush walked somberly through a memorial where 250,000 Rwandans killed in the 1994 genocidal slaughter are buried, emerging to call it "a moving place that can't help but shake your emotions to the very foundation."
President Bush meets with Rwanda's President Paul Kagame as part of his five-nation, six-day Africa tour.
Bush, who is in Rwanda on his third stop in five-nation, six-day Africa tour, announced the United States is contributing $100 million to help train and equip the U.N.-African Union mission in western Sudan's Darfur region, where roughly 200,000 people have been killed and at least 2 million displaced.
At one point on the tour, memorial director Freddy Mutanguha told Bush "the United Nations knew about what was going on in our country."
The United States and the international community were criticized for not taking action to stop the slaughter of about 800,000 Rwandans, most of them Tutsis killed by members of the rival Hutu ethnic group.
Bush later thanked Mutanguha for creating the memorial "to remind people that there is evil in the world and that evil must be confronted."
White House spokeswoman Dana Perino revealed the new funding for the Darfur mission aboard Air Force One as the presidential entourage approached Rwanda from Tanzania on Tuesday morning.
The United States has provided nearly 7,000 Rwandan troops with training and spent more than $17 million to equip and transport Rwandan troops for service in Sudan, according to national security adviser Stephen Hadley.
Nomadic Arab militias -- allegedly allied with the Sudanese government -- have targeted pastoral black Africans in Darfur. On Thursday, Bush reiterated the United States' characterization of the conflict, saying, "In Darfur, the U.S. will continue to call the killing what it is -- genocide."
Bush and first lady Laura Bush were greeted by Rwanda's President Paul Kagame and his wife -- along with two Rwandan children carrying flowers -- as they stepped off Air Force One at the Kigali airport.
As Bush walked down a red carpet, a military band played and a company of Rwandan soldiers stood at attention on the tarmac nearby. Tribal dancers then performed for the president.
Bush visited Benin and Tanzania already on his trip, which stresses U.S. initiatives to combat HIV/AIDS, malaria and poverty on the continent.
From Rwanda, the Bushes will travel to Ghana and then to Liberia.
The trip -- Bush's second to the continent and his wife's fifth -- is largely focused on U.S. aid programs, which include initiatives to combat HIV/AIDS, malaria and poverty. E-mail to a friend