ABUJA (Reuters) - Nigerian literary icon Chinua Achebe said he rejected an award due to be given to him by President Goodluck Jonathan this week because the political problems in Africa's most populous nation had not been tackled since he snubbed the prize seven years ago. Achebe, author of 'Things Fall Apart' turned down the national title of 'Commander of the Federal Republic' in 2004 when Olusegun Obasanjo was head of state. He wrote to President Obasanjo at the time, saying he was "appalled" by the "cliques" who had turned Nigeria into "a bankrupt and lawless fiefdom".