Outline six factors that led to the formation of federalism in Nigeria.

Federalism is a system in which governmental powers are shared between a central (national) government and component (regional or state) governments, each supreme within its own sphere. Several factors made federalism the most suitable system for Nigeria.

1. Large size of the country: Nigeria's vast geographical area made unitary control from a single centre impracticable, so power had to be devolved to component units.
2. Ethnic and cultural diversity: The existence of many ethnic groups (Hausa-Fulani, Yoruba, Igbo and hundreds of minorities) with different languages and customs demanded a system that would allow each group some measure of self-rule.
3. Fear of domination by the minorities and larger groups: Smaller ethnic groups feared being swallowed up by the larger ones, so federalism was adopted to protect them and give each region autonomy.
4. Existence of regional differences in development: Uneven economic, educational and social development among the regions made a single uniform policy unworkable, favouring regional governments.
5. Colonial administrative arrangement: The British administered Nigeria as separate protectorates and later as regions (North, East and West), laying a structural foundation for a federal arrangement.
6. Desire for unity in diversity: Federalism offered a way to hold the diverse peoples together in one nation while allowing each unit to preserve its identity, thus promoting national unity without total centralisation.