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EXPLAINER-The race for Nigeria's presidency in 2019

By Paul Carsten

ABUJA, April 13 (Reuters) - Nigeria's President Muhammadu Buhari announced on Monday he wants to seek another term in office in February 2019 elections. With that declaration, the race to lead Africa's largest democracy is underway. The path ahead could be tough for his All Progressives Congress (APC), the People's Democratic Party (PDP) opposition and any other party that may contest the vote.

WHAT'S AT STAKE?

Buhari's 2015 victory was built on three promises: to rid Nigeria of its endemic corruption, to fix the economy and to defeat threats to security.

The results have been mixed. He has not brought an end to the war with the Boko Haram Islamist insurgency, now in its tenth year. The economy entered and climbed out of recession under Buhari, yet the average Nigerian is still getting poorer; and opponents say his administration is failing to tackle endemic corruption, targeting only the president's enemies and ignoring allegations against his allies.

After spending five months in Britain last year being treated for an undisclosed ailment, opposition groups and other critics said he was unfit for office and his administration was beset by inertia.

If Buhari wins again, his opponents say, Nigeria would be in for another four years of political torpor.

On the other hand, the president's supporters say the opposition has little to offer beyond "Not Buhari" - a sign of Nigeria's personality-driven politics.

FAULT LINES AND FRACTURES

Nigeria is deeply divided. One of the most fundamental rifts is between the mainly Muslim north and the largely Christian south, and the population is fairly evenly split between the religions. Africa's most populous country also has more than 200 ethnic groups, with the three largest the Hausa in the north, the Yoruba in the southwest and the Igbo in the south-east.

That has led to an unofficial power-sharing agreement among Nigeria's political elite. The presidency, in theory, is to alternate between the north and south after every two four-year terms. Buhari, a northern Muslim, has held the post since 2015. His predecessor, the PDP's Goodluck Jonathan, is a southern Christian. In keeping with the accord, the PDP is set to select a northerner as its candidate for 2019.

Those divisions play into what could be one of the major issues of the 2019 elections: deadly violence between mostly Christian farmers and mainly Muslim nomadic herders that has broken out in the Nigerian hinterland states known as the Middle Belt.

Buhari's critics say he is soft-peddling justice for the killings because he, like most of the herders, is from the Fulani ethnic group and is Muslim.