Which country is known for having a long civil war that ended in 1996?

The country known for having a long civil war that ended in 1996 is El Salvador. The Salvadoran Civil War lasted from 1980 to 1992, resulting in significant social, political, and economic changes within the country. It was a conflict primarily between the government, which was supported by the military and upper classes, and leftist guerrilla groups. The war led to widespread human rights violations and the displacement of large segments of the population.

In the context of the other options, Nicaragua experienced a civil conflict known as the Sandinista revolution during the late 1970s and early 1980s, with external influences from the U.S. government. Guatemala's civil war lasted from 1960 to 1996, leading to a prolonged struggle characterized by severe violence and oppression. Honduras, while it has faced political instability, did not experience a civil war of the same duration or intensity as El Salvador. Therefore, El Salvador is distinctly recognized for its civil war that concluded in 1992, with the aftermath and peace process continuing into 1996.