Question: Who built the largest ancient Inca empire, in the region that the Bobangi sold slaves to?

full_context: Document 1: Sahara: The Byzantine Empire ruled the northern shores of the Sahara from the 5th to the 7th centuries. After the Muslim conquest of Arabia (Arabian peninsula) the Muslim conquest of North Africa began in the mid-7th to early 8th centuries, Islamic influence expanded rapidly on the Sahara. By the end of 641 all of Egypt was in Muslim hands. The trade across the desert intensified. A significant slave trade crossed the desert. It has been estimated that from the 10th to 19th centuries some 6,000 to 7,000 slaves were transported north each year.
Document 2: Black people: Historians estimate that between the advent of Islam in 650CE and the abolition of slavery in the Arabian Peninsula in the mid-20th century, 10 to 18 million sub-Saharan Black Africans were enslaved by Arab slave traders and transported to the Arabian Peninsula and neighboring countries. This number far exceeded the number of slaves who were taken to the Americas. Several factors affected the visibility of descendants of this diaspora in 21st-century Arab societies: The traders shipped more female slaves than males, as there was a demand for them to serve as concubines in harems in the Arabian Peninsula and neighboring countries. Male slaves were castrated in order to serve as harem guards. The death toll of Black African slaves from forced labor was high. The mixed-race children of female slaves and Arab owners were assimilated into the Arab owners' families under the patrilineal kinship system. As a result, few distinctive Afro-Arab black communities have survived in the Arabian Peninsula and neighboring countries.
Document 3: Indigenous peoples of the Americas: Ecuador was the site of many indigenous cultures, and civilizations of different proportions. An early sedentary culture, known as the Valdivia culture, developed in the coastal region, while the Caras and the Quitus unified to form an elaborate civilization that ended at the birth of the Capital Quito. The Cañaris near Cuenca were the most advanced, and most feared by the Inca, due to their fierce resistance to the Incan expansion. Their architecture remains were later destroyed by Spaniards and the Incas.
Document 4: Peru: Peru ( (listen); Spanish: Perú [peˈɾu]; Quechua: Piruw Republika [pʰɪɾʊw]; Aymara: Piruw Suyu [pɪɾʊw]), officially the Republic of Peru (Spanish: República del Perú ), is a country in western South America. It is bordered in the north by Ecuador and Colombia, in the east by Brazil, in the southeast by Bolivia, in the south by Chile, and in the west by the Pacific Ocean. Peru is a megadiverse country with habitats ranging from the arid plains of the Pacific coastal region in the west to the peaks of the Andes mountains vertically extending from the north to the southeast of the country to the tropical Amazon Basin rainforest in the east with the Amazon river.Peruvian territory was home to several ancient cultures.  Ranging from the Norte Chico civilization in the 32nd century BC, the oldest civilization in the Americas and one of the five cradles of civilization, to the Inca Empire, the largest state in pre-Columbian America, the territory now including Peru has one of the longest histories of civilization of any country, tracing its heritage back to the 4th millennia BCE.
Document 5: Inca Empire: The Incan economy has been described in contradictory ways by scholars: as ``feudal, slave, socialist (here one may choose between socialist paradise or socialist tyranny) ''. The Inca empire functioned largely without money and without markets. Instead, exchange of goods and services was based on reciprocity between individuals and among individuals, groups, and Inca rulers.`` Taxes'' consisted of a labor obligation of a person to the Empire. The Inca rulers (who theoretically owned all the means of production) reciprocated by granting access to land and goods and providing food and drink in celebratory feasts for their subjects.
Document 6: Central African Republic: During the 16th and 17th centuries slave traders began to raid the region as part of the expansion of the Saharan and Nile River slave routes. Their captives were slaved and shipped to the Mediterranean coast, Europe, Arabia, the Western Hemisphere, or to the slave ports and factories along the West and North Africa or South the Ubanqui and Congo rivers. In the mid 19th century, the Bobangi people became major slave traders and sold their captives to the Americas using the Ubangi river to reach the coast. During the 18th century Bandia-Nzakara peoples established the Bangassou Kingdom along the Ubangi River.
Document 7: Charleston, South Carolina: By 1840, the Market Hall and Sheds, where fresh meat and produce were brought daily, became a hub of commercial activity. The slave trade also depended on the port of Charleston, where ships could be unloaded and the slaves bought and sold. The legal importation of African slaves had ended in 1808, although smuggling was significant. However, the domestic trade was booming. More than one million slaves were transported from the Upper South to the Deep South in the antebellum years, as cotton plantations were widely developed through what became known as the Black Belt. Many slaves were transported in the coastwise slave trade, with slave ships stopping at ports such as Charleston.
Document 8: Inca Empire: From 1438 to 1533, the Incas incorporated a large portion of western South America, centered on the Andean Mountains, using conquest and peaceful assimilation, among other methods. At its largest, the empire joined Peru, large parts of modern Ecuador, western and south central Bolivia, northwest Argentina, north and central Chile and a small part of southwest Colombia into a state comparable to the historical empires of Eurasia. Its official language was Quechua. Many local forms of worship persisted in the empire, most of them concerning local sacred Huacas, but the Inca leadership encouraged the sun worship of Inti -- their sun god -- and imposed its sovereignty above other cults such as that of Pachamama. The Incas considered their king, the Sapa Inca, to be the ``son of the sun. ''
Document 9: Inca Empire: Inca Empire Tawantinsuyu (Quechua) 1438 -- 1533 The Inca Empire at its greatest extent Capital Cusco (1438 -- 1533) Languages Quechua (official), Aymara, Puquina, Jaqi family, Muchik and scores of smaller languages. Religion Inca religion Government Divine, absolute monarchy Sapa Inca 1438 -- 1471 Pachacuti 1471 -- 1493 Túpac Inca Yupanqui 1493 -- 1527 Huayna Capac 1527 -- 1532 Huáscar 1532 -- 1533 Atahualpa Historical era Pre-Columbian era Pachacuti created the Tawantinsuyu 1438 Civil war between Huáscar and Atahualpa 1529 -- 1532 Spanish conquest led by Francisco Pizarro 1533 End of the last Inca resistance 1572 Area 1527 2,000,000 km (770,000 sq mi) Population 1527 est. 10,000,000 Density 5 / km (13 / sq mi) Preceded by Succeeded by Kingdom of Cusco Governorate of New Castile Governorate of New Toledo Neo-Inca State Today part of Argentina Bolivia Chile Colombia Ecuador Peru
Document 10: Inca Empire: The Inca Empire (Quechua: Tawantinsuyu, lit. ``The Four Regions ''), also known as the Incan Empire and the Inka Empire, was the largest empire in pre-Columbian America, and possibly the largest empire in the world in the early 16th century. The administrative, political and military center of the empire was located in Cusco in modern - day Peru. The Inca civilization arose from the highlands of Peru sometime in the early 13th century. Its last stronghold was conquered by the Spanish in 1572.
Document 11: History of Bolivia: After the fall of Tiwanaku empire, the many Aymara Lake Titicaca were conquered by the Inca empire. Prior to the Spanish conquest, the Andean province of Qullasuyu was a part of the Inca empire, while the northern and eastern lowlands were inhabited by independent nomadic tribes. Spanish conquistadors, arriving from Cuzco and Asunción took control of the region in the 16th century. During most of the Spanish colonial rule, Bolivia was known as Upper Peru and administered by the Royal Audiencia of Charcas. After the first call for independence in 1809, 16 years of war followed before the establishment of the Bolivian Republic, named for the Liberator Simón Bolívar, on August 6, 1825. Since then Bolivia has endured regular periods of political and economic instability, including the loss of various provinces to its neighbors, such as Acre, parts of the Gran Chaco and its Pacific coast, making it a land - locked country.
Document 12: History of the Incas: The Inca people began as a tribe in the Cusco area around the 12th century AD. Under the leadership of Manco Cápac, they formed the small city - state of Cusco Quechua Qosqo.
Document 13: Atlantic slave trade: The Atlantic slave trade or transatlantic slave trade involved the transportation by slave traders of enslaved African people, mainly from Africa to the Americas, and then their sale there. The slave trade used mainly the triangular trade route and its Middle Passage, and existed from the 16th to the 19th centuries. The vast majority of those who were enslaved and transported in the transatlantic slave trade were Africans from central and western Africa, who had been sold by other West Africans to Western European slave traders (with a small number being captured directly by the slave traders in coastal raids), who brought them to the Americas. The South Atlantic and Caribbean economies especially were dependent on the supply of secure labour for the production of commodity crops, making goods and clothing to sell in Europe. This was crucial to those western European countries which, in the late 17th and 18th centuries, were vying with each other to create overseas empires.
Document 14: Guinea-Bissau: Guinea-Bissau was once part of the kingdom of Gabu, part of the Mali Empire; parts of this kingdom persisted until the 18th century. Other parts of the territory in the current country were considered by the Portuguese as part of their empire. Portuguese Guinea was known as the Slave Coast, as it was a major area for the exportation of African slaves by Europeans to the western hemisphere. Previously slaves had been traded by Arabs north to the northern part of Africa and into the Middle East.
Document 15: Nigeria: For centuries, various peoples in modern-day Nigeria traded overland with traders from North Africa. Cities in the area became regional centres in a broad network of trade routes that spanned western, central and northern Africa. In the 16th century, Spanish and Portuguese explorers were the first Europeans to begin significant, direct trade with peoples of modern-day Nigeria, at the port they named Lagos and in Calabar. Europeans traded goods with peoples at the coast; coastal trade with Europeans also marked the beginnings of the Atlantic slave trade. The port of Calabar on the historical Bight of Biafra (now commonly referred to as the Bight of Bonny) become one of the largest slave trading posts in West Africa in the era of the transatlantic slave trade. Other major slaving ports in Nigeria were located in Badagry, Lagos on the Bight of Benin and on Bonny Island on the Bight of Biafra. The majority of those enslaved and taken to these ports were captured in raids and wars. Usually the captives were taken back to the conquerors' territory as forced labour; after time, they were sometimes acculturated and absorbed into the conquerors' society. A number of slave routes were established throughout Nigeria linking the hinterland areas with the major coastal ports. Some of the more prolific slave traders were linked with the Oyo Empire in the southwest, the Aro Confederacy in the southeast and the Sokoto Caliphate in the north.
ground_truth: Sapa Inca
sub_queries: Who did the Bobangi sell slave to? Answer: the Americas
who built the largest inca empire in the ancient the Americas Answer: Sapa Inca