Throughout history, due to Nigeria's many ethnicities and small amounts of land, conflicts have broken out quite often. The most relevant example is of the Civil War that took place in Nigeria from 1967-1970. This war took place right after Nigeria gained Independence from Great Britain. The primarily muslim Hausa people began to bombard the Christian Ibos with attacks, in an attempt to gain political power while they had an opportunity. The Igbo people began to fight for their own land, which they called the Biafra territory. Eventually they won, and broke off, but Nigeria ultimately had the last say and gained complete political control of Biafra in 1970 when they took over the capital, Ojukwu. During this civil war, a major genocide was taking place between the Igbo and Hausa people, the Hausa people being the bringers of the violence, and the Igbos being the victims.
Below is a picture of Igbo children, victims of the terrible injustice of the Hausa/Igbo genocide, and a video explaining ethnic relations in Nigeria, and the effects of the government on these conflicts.