The Dayton peace accord, which ended the 1992- 1995 war in Bosnia and has been serving as the country's constitution, needs to evolve, U.S. Undersecretary of State Nicholas Burns said Wednesday in Sarajevo, according to DPA. Praising the latest progress towards ethnically unifying the country's military and police force, Burns said Bosnian authorities should now pay more attention to constitutional changes. The next step, he said, should be a strong one-man presidency instead of the current three-member presidency, a strengthened prime minister's position and an effective parliament to replace the current large administration. "These reforms would be a logical extension and they are the future that would lead from the progress made on defence reform and police reform," Burns told reporters in Sarajevo. The U.S. administration "looks forward to working with Bosnian leaders in future constitutional reform", Burns said. Starting a three-day Balkan tour in Bosnia, Burns informed Bosnia- Herzegovina's leadership that the U.S. was organizing a celebration of the tenth anniversary of the Dayton peace agreement, to be held in November in Washington D.C.