In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.
--------
Question: The Nigerian Civil War, commonly known as the Biafran War (6 July 1967 -- 15 January 1970), was a war fought between the government of Nigeria and the secessionist state of Biafra. Biafra represented nationalist aspirations of the Igbo people, whose leadership felt they could no longer coexist with the Northern-dominated federal government. The conflict resulted from political, economic, ethnic, cultural and religious tensions which preceded Britain's formal decolonisation of Nigeria from 1960 to 1963. Immediate causes of the war in 1966 included a military coup, a counter-coup and persecution of Igbo living in Northern Nigeria. Control over oil production in the Niger Delta played a vital strategic role.

Answer: causes of nigerian civil war of 1967 pdf

Question: After growing up in Oklahoma and serving in the United States Army, Miller began his musical career as a songwriter in the late 1950s, writing such hits as 'Billy Bayou' and 'Home' for Jim Reeves and 'Invitation to the Blues' for Ray Price. He later began a recording career and reached the peak of his fame in the mid-1960s, continuing to record and tour into the 1990s, charting his final top 20 country hit 'Old Friends' with Willie Nelson in 1982. He also wrote and performed several of the songs for the 1973 Disney animated film Robin Hood. Later in his life, he wrote the music and lyrics for the 1985 Tony-award winning Broadway musical Big River, in which he acted.

Answer: who wrote the song invitation to the blues

Question: In 1681, in partial repayment of a debt, Charles II of England granted Penn a charter for what would become the Pennsylvania colony. Despite the royal charter, Penn bought the land from the local Lenape to be on good terms with the Native Americans and ensure peace for his colony. Penn made a treaty of friendship with Lenape chief Tammany under an elm tree at Shackamaxon, in what is now the city's Fishtown neighborhood. Penn named the city Philadelphia, which is Greek for brotherly love (from philos, 'love' or 'friendship', and adelphos, 'brother'). As a Quaker, Penn had experienced religious persecution and wanted his colony to be a place where anyone could worship freely. This tolerance, far more than afforded by most other colonies, led to better relations with the local native tribes and fostered Philadelphia's rapid growth into America's most important city.

Answer:
why philadelphia called the city of brotherly love