ABUJA, May 26 (AFP) - The 1999 Nigerian constitution under which Nigeria returns to civilian rule gives the country a strong presidential system, balanced with key legislative and regulatory powers for parliament. Released officially on May 14, Nigeria's fourth basic law since independence in 1960 was drawn up by the outgoing military regime. Following are key points of the constitution. STRUCTURE OF THE REPUBLIC: The Federal Republic of Nigeria consists of 36 states and the Federal Capital Territory, Abuja. EXECUTIVE POWER: Governed by a president and vice-president who will name the cabinet or Federal Executive Council with one member from each of the 36 states. TENURE OF PRESIDENT: A maximum of two four-year terms. LEGISLATURE: A two-chamber National Assembly, comprising a 109-member Senate and a 360-member House of Representatives. DECLARATION OF WAR: The president, who is Commander in Chief of the armed forces, will need parliamentary approval to declare war, deploy troops abroad or keep them there. INTERNATIONAL TREATIES To be approved by both house of the National Assembly. JUSTICE: The judicial system is topped by a Supreme Court, sitting over a Court of Appeal. A Sharia Court of Appeal will operate for matters of Islamic personal law. IMPEACHMENT: The president can be impeached and removed from office if found guilty of "gross misconduct in the performance of his duties" in a vote of more than two thirds of both houses. PRESIDENTIAL VETO: Under the constitution, the president has the right to veto any measure passed by parliament but a two-thirds majority vote by both houses of the assembly can overturn the veto.  