Free Internet-based encyclopedia, Wikipedia, has recently updated its meaning of failed states and cited Nigeria as an example of a failed state.
According to Wikipedia, a failed state is a political body that has disintegrated to a point where basic conditions and responsibilities of a sovereign government no longer function properly.
The common characteristics of a failing state include a central government so weak or ineffective that it has an inability to raise taxes or other support, and has little practical control over much of its territory and hence there is a non-provision of public services. When this happens, widespread corruption and criminality, the intervention of state and non-state actors, the appearance of refugees and the involuntary movement of populations, sharp economic decline, and foreign military intervention can occur.
In the wake of the happenings in Nigeria in recent years and the description of a failed state, Wikipedia might not be wrong.
Countries also listed by Wikipedia includes; Syria, Somalia, Myanmar, Nigeria, Iraq, Yemen, Turkey, Democratic Republic of Congo, Central African Republic, Rwanda, Liberia, Yugoslavia, Lebanon, Afghanistan, Sudan, South Sudan.