Question: Zou is one of the twelve departments of an African country formerly known as what?

Context paragraphs:
Collines Department: Collines is one of the twelve departments of Benin.  The departments that border Collines are Plateau, Borgou, Zou, and Donga.  The main ethnic groups in the department according to the National population census are Yoruba of the Nagot group at 46.8% and the Yoruba of the Idaasha at 14.9% for a total of 61.7% to constitute the majority, the Yoruba group is followed by the Mahi at 25.7% or just over a quarter of the regional population, while the Fon represent 13% of the population.  The département of Collines was created in 1999 when it was split off from Zou Department.  Since 2016, the capital is Igbo Idaasha, known as Dassa Zoumé.

Donga Department: Donga is one of the twelve departments of Benin.  The capital of Donga is Djougou.  The département of Donga was created in 1999 when it was split off from Atakora Department.  Donga is subdivided into five communes, each centered at one of the principal towns, namely, Bassila, Copargo, Djougou Rural, Djougou Urban and Ouaké.

Borgou Department: Borgou is one of the twelve departments of Benin.  Borgou borders the country of Nigeria and the departments of Alibori, Atakora, Collines and Donga.  The capital of Borgou is Parakou.  The département of Borgou was bifurcated in 1999 with its northern territory moved to the newly created Alibori Department.

Atlantique Department: Atlantique is one of the twelve departments in Benin.  The department is located in south central Benin along the Atlantic coast, between the Mono and Couffo in the west, Zou in the north, and Oueme in the east.  Ethnically, the Fon at 61% constitute the majority of the population.  They are followed by the Yoruba at 10%, Aja at 7%.  Other groups make up the remaining 22%.  Important towns in the department include Allada, Ouidah, Abomey-Calavi and Godomey.  The département of Atlantique was bifurcated during 1999 when some of its territory were moved to the newly formed Littoral Department.

Benin: Benin ( or - ; ; French: "Bénin" ] ), officially the Republic of Benin (French: "République du Bénin" ) and formerly Dahomey, is a country in West Africa.  It is bordered by Togo to the west, Nigeria to the east, and Burkina Faso and Niger to the north.  The majority of its population lives on the small southern coastline of the Bight of Benin, part of the Gulf of Guinea in the northernmost tropical portion of the Atlantic Ocean.  The capital of Benin is Porto-Novo, but the seat of government is in Cotonou, the country's largest city and economic capital.  Benin covers an area of 114,763 square kilometers and its population in was estimated to be approximately /1e6 round 2 million.  Benin is a tropical nation, highly dependent on agriculture, with substantial employment and income arising from subsistence farming.

Littoral Department: Littoral is one of the twelve departments of Benin.  Littoral is the smallest department of all of the twelve in the country, as well as the most cosmopolitan.  Its capital is Cotonou, Benin's largest city.  The area is 79 km2 .  The department of Littoral was created in 1999 by splitting territories from Atlantique Department.

The Day the World Gets 'Round: "The Day the World Gets 'Round" is a song by English musician George Harrison, released on his 1973 album "Living in the Material World".  Harrison was inspired to write the song following the successful Concert for Bangladesh shows, which were held in New York on 1 August 1971 as a benefit for refugees from the country formerly known as East Pakistan.  The lyrics reflect his disappointment that such a humanitarian aid project was necessary, given the abundance of resources available across the planet, and his belief that if all individuals were more spiritually aware, there would be no suffering in the world.  Adding to Harrison's frustration while writing the song, the aid project became embroiled in financial problems, as commercial concerns delayed the release of the "Concert for Bangladesh" album, and government tax departments failed to embrace the goodwill inherent in the venture.

Plateau Department: Plateau is one of the twelve departments of Benin.  The population is predominantly Yoruba of the following subgroups: Nagot group at 45.7% and the Ohori (also known as the "Holli") at 20.9% for a total of 66.6% to constitute the majority.  The Yoruba group is followed by the Fon group of the following subgroups: Guns at 12.4% of the population, Fon at 8.2% of the population, and Torri 6.5%.  The département of Plateau was created in 1999 with an area of 2,835 sq. km, when it was split off from Ouémé Department.  Plateau is subdivided into five communes, each centered at one of the principal towns, namely, Adja-Ouèrè, Ifangni, Kétou, Pobè and Sakété.

Zou Department: Zou is one of the twelve departments of Benin.  The department obtains its name from the Zou River which travels through the department before emptying into the Atlantic in the south of the country.  The majority of the population are the Fon people with 91% population, while Aja people make up 4% and Yoruba make up 3% of the populace.  The departement of Zou was split in 1999 with the northern territory moved to the newly created Collines Department.  The capital of Zou is Abomey.  Zou is subdivided into nine communes, each centered at one of the principal towns, namely, Abomey, Agbangnizoun, Bohicon, Cové, Djidja, Ouinhi, Za-Kpota, Zangnanado and Zogbodomey.

Kouffo Department: Kouffo is one of the twelve departments of Benin.  Kouffo borders the country of Togo and it also borders the departments of Mono, Zou, and Atlantique.  Since 2008, the capital is Aplahoué.  The département of Kouffo was created in 1999 when it was split off from Mono Department.

Supporting paragraphs: Zou Department Benin
Answer: Dahomey