US Secretary of State Hilary Clinton is to visit Northern Ireland, it was confirmed Friday.  Mrs Clinton will travel to Belfast on December 7 to meet officials, as well as discuss the peace process and investment opportunities, the British media said quoting American officials.  It could be one of her last foreign engagements.  The visit is part of a four-day trip that will also take in Dublin, the Czech Republic and Belgium.  Clinton, who visited Northern Ireland three times with her husband former US President Bill Clinton during the 1990s, plans to discuss the trilateral US-Ireland Research and Development Partnership and economic opportunities for Northern Ireland.  Later, she will take part in an event hosted by The Ireland Funds - a global fundraising network supporting programs of peace and reconciliation, arts and culture, education, and community development in Northern Ireland and the Republic of Ireland.  Her journey to Belfast will follow a host of engagements in the Irish Republic.  In Dublin, she is expected at a ministerial meeting of the Organisation for Security and Co-operation in Europe (OSCE) and will discuss areas of cooperation in promoting peace, human rights, and economic growth with Irish officials to discuss, the Irish radio said.  She is due to deliver a major speech on US achievements in support of human rights globally.  The former First Lady has been among the most travelled US politicians, however, her term runs out next month and has publicly stated that she does not wish to have a second term.