The aim of the analysis in this essay will be divided into two cases. In the first, I will study the formation of a new State and why a geographic area of a country decides to make an secession. The focus will be on the secession of Biafra from Nigeria in 1967 and how the causes and explanations behind this secession, get in the Swedish literature as well as the international literature. In Case 2, I will use a explanation games, as a means to give pupils more understanding and to make it more clear, why a geographical area chooses to make a secession, and where I will use the secession of the Biafra from Nigeria as my example (Case 1). To more easily understand and answer  the question, why the geographical area of Biafra in south-eastern Nigeria chose to do an secession, I have chosen to study my Case 1 from a social and political context. The broader aim of this essay is, during the use of theories to search which role the ethnicity and the ethnic pattern had in the decisions of the Biafra to do an secession and create a new state. But also to explore the didactic elements and methods in history teaching, we as teachers can use, in order to more clearly describe and explain why a geographical area decides to do an secession? Results from case 1 showed that ethnicity was a motivation for me to respond to the social and political events in Nigeria and to be able to explain why Biafra chose to break away. There are other reasons, but to me it was ethnicity and ethnic pattern the main causes and it became an ethnic breakaway from the Biafra. In case 2 the explanations games, need not be the only method for the teacher to more clearly explain for example why Biafra chose to break away from Nigeria but it can be a way to understand more.