Three similar cultures in Nigeria

As we all know that traveling is part of education; getting out of one's comfort zone and knowing what goes on around does not only keep one well informed, but, also makes one comfortable enough to participate in an intellectual discussion and to interact at any environment.
Nigeria is located in the West of Africa. Itis the most populous Black Country in the world. It gained independence from the British in 1960. It is divided into 3 main regions ethnic groups that is, the Hausas, Ibos, and the Yorubas. Each is named after its language and each has its own characteristic culture. Culture as generally known is the people's way of life, belief and practices. Most often, it goes along with the style of dressing of the society in question.
The Hausas are the northerners. They are mostly Moslems; and are conservatively dressed with head and body covered. The Ibos are located in the southeast area of Nigeria, and are mostly Christians. They dress in a more westernized way. The Yorubas are located in the southwest part of Nigeria and are mixture of Muslims and Christians, they people dress according to religion affiliation. As an outsider one will wonder what these 3 groups have in common. There are a lot of cultures they share but for the sake of time I will just inform you about three of the cultures.
One culture is education; Because Nigeria is a mixed society there are over 250 different languages spoken but English is the official language and that is the only way everyone communicate. There is a 6-3-3-4 system of education. 6 years in elementary school, 3 years each in junior and senior secondary schools, and 4 years in college/university. A year of work outside one's ethic region to serve the country is observed after the college degree, the purpose of this is for one to know about another ethnic group and to break culture shock; it also unites all graduates (youths)