"The U.S. government considers its relationship with Nigeria, Africa's largest producer of oil and its largest economy, to be among the most important on the continent. The country is Africa's most populous, with more than 180 million people, roughly evenly divided between Muslims and Christians. Nigeria, which transitioned from military to civilian rule in 1999, ranked until recently among the top suppliers of U.S. oil imports, and is a major recipient of U.S. foreign aid. It is an influential actor in African politics and a major troop contributor to U.N. peacekeeping missions. [...] The Obama Administration has been supportive of reform initiatives in Nigeria, including anti-corruption efforts, economic and electoral reforms, energy sector privatization, and programs to promote peace and development in the Niger Delta. In 2010, the Administration established the U.S.-Nigeria Binational Commission, a strategic dialogue to address issues of mutual concern. Congress regularly monitors Nigerian political developments, and some Members have expressed concern with corruption, human rights abuses, and the threat of violent extremism in Nigeria. Congress oversees more than $600 million in U.S. foreign aid programs in Nigeria-one of the largest U.S. bilateral assistance packages in Africa."
CRS Report for Congress, RL33964
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html