The United States on Tuesday hinted on the reasons why President Barack Obama won't visit Nigeria during his upcoming three-nation trip to Africa. According to US officials, the ongoing insecurity appeared to be responsible for the exclusion of Nigeria in Obama's second visit to the continent. Obama is scheduled to visit Senegal, Tanzania and South Africa. The US government said the trip would focus on trade and investment, democratic institution-building, young people, and enhancing economic growth. American Deputy National Security Advisor, Ben Rhodes, made this clarifications at a briefing on Tuesday. The briefing was addressed jointly with the Senior Director for African Affairs Grant Harris and Senior Director for Development and Democracy Gayle Smith, on Obama's upcoming visit. The text of the briefing was made available to journalists in Abuja by the Information Office of the Public Affairs Section of the US Embassy. Rhodes said...