Under civil law, Nigeria recognizes polygamous unions.

The northern states of Bauchi, Borno, Gombe, Jigawa, Kaduna, Kano, Katsina, Kebbi, Niger, Sokoto, Yobe, and Zamfara recognize polygamous marriages as equivalent to monogamous marriages, as all twelve are governed by Sharia Law, which allows for a man to take more than one wife as long as he treats them equally. Zamfara State was the first to legislate polygamy, which occurred on January 7, 2000. Gombe State has been the most recent state to provide for civil polygamy, legalizing it on December 14, 2001. As the southern region of Nigeria is composed of mostly Christians, polygamous marriages have not been legally introduced at this time.

Despite such, attempts to introduce Sharia (thereby legalizing polygamy) have been made in Oyo State, Kwara State, Lagos State a various others, yet all unsuccessful. However, polygamous unions are recognized by customary law in Nigeria, alledgely providing a handful of benefits for those in polygamous unions ranging from inheritance rights to child custody.
As of 2009, there has yet to be any debate of introducing a measure that would allow for civil polygamous marriages to be recognized within the entire country of Nigeria, letting the legislation play out on a state-by-state basis rather than introducing a nationwide measure.

What do you think? Should Nigeria as a whole legalize polygamy? and have you had any experiences with regards to this issue?