"Too often in the past year we received painful reminders that human rights, though self-evident, are not self-enforcing," Secretary of State Condoleezza Rice said in presenting the State Department's annual survey of human rights practices.
"We are recommitting ourselves to call every government to account that still treats the basic rights of its citizens as options," Rice said, adding that the United States does not hold itself out as perfect in that regard.
The report cited progress in some countries but stressed a series of "sobering realities" reflecting a significant deterioration in conditions in some of the world's most populous states like China and Russia. The United States has joined both of those countries in diplomatic efforts to resolve nuclear confrontations with Iran and North Korea.
"Genocide was the most sobering reality of all," it said in the 2006 "Country Reports on Human Rights Practices," noting that mass killings continued to "ravage" Darfur nearly 60 years after the world vowed "Never again!" following the Holocaust.
Just days before senior U.S. diplomats expect to meet Sudanese President Omar al-Bashir in Khartoum, the State Department blamed the Sudanese military and proxy militia for the genocide in Darfur. More that 200,000 have died and an estimated 2.5 million have been displaced in the western Sudan region during four years of war and upheaval.
"The Sudanese government and government-backed janjaweed militia bear responsibility for the genocide in Darfur," the report said. The report said atrocities continue, including some committed by indigenous rebels.
"All parties to the conflagration committed serious abuses, including widespread killing of civilians, rape as a tool of war, systematic torture, robbery and recruitment of child soldiers," the report said.
Washington first declared the situation in Darfur a "genocide" in 2004 when then-Secretary of State Colin Powell used the word in congressional testimony. But other countries and the United Nations have refrained from using the word, and some U.S. officials have recently toned down such language.
Tuesday's blunt criticism, particularly of Khartoum, comes two days before U.S. special envoy for Sudan Andrew Natsios is to see al-Bashir and a week before Assistant Secretary of State Barry Lowenkron plans to meet the Sudanese president.