You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "what was the cause of the nigerian civil war?" whose answer is a military coup.
Each document should contain about 30 words, and these documents should contain useful information.

Query: causes of nigerian civil war
Useful Output:

Doc 1: The war was a logical manifestation of unaddressed ethnic tension that typified Nigeria's colonial society. It shows that even after achieving
Doc 2: The first military coup exacerbated tribal tensions that led to the persecution and marginalization of innocent Igbos in Nigeria.
Doc 3: The Nigerian Civil War was caused by deep ethnic divisions, political instability, and economic struggles. The conflict remains a significant
Doc 4: Major Causes of the Nigerian Civil War. First and foremost, the Nigerian Civil War traces its roots to the British colonial period. Great
Doc 5: Immediate causes of the war in 1966 included ethno-religious violence and anti-Igbo pogroms in Northern Nigeria, a military coup, a counter-coup