2nd example of slavery in
history, why it was used,
how were slaves treated, ect.

The history of slavery spans many cultures, nationalities, and religions from ancient times to the present day. Likewise, its victims have come from many different ethnicities and religious groups. The social, economic, and legal positions of enslaved people have differed vastly in different systems of slavery in different times and places.[1]Slavery was relatively rare in pre-civilisation hunter-gatherer populations,[2] as it develops under conditions of social stratification.[3] Slavery operated in the first civilizations (such as Sumer in Mesopotamia,[4] which dates back as far as 3500 BC). Slavery features in the Mesopotamian Code of Hammurabi (c. 1860 BCE), which refers to it as an established institution.[5] Slaver hv y was widespread in the ancient world. It was found in almost every ancient civilization, including the Roman Empire. It became less common throughout Europe during the Early Middle Ages, although it continued to be practiced in some areas. Both Christians and Muslims captured and enslaved each other during centuries of warfare in the Mediterranean.[6] Islamic slavery encompassed mainly Western and Central Asia, Northern and Eastern Africa, India, and Europe from the 7th to the 20th century. Beginning in the 16th century, European merchants initiated the transatlantic slave trade, purchasing enslaved Africans from West African kingdoms and transporting them to Europe's colonies in the Americas. The transatlantic slave trade was eventually curtailed due to European and American governments passing legislation abolishing their nation's involvement in it.

Although slavery is no longer legal anywhere in the world, human trafficking remains an international problem. An estimated 25-40 million people were enslaved as of 2013, the majority of these in Asia.[7] During the 1983–2005 Second Sudanese Civil War people were taken into slavery.[8] Evidence emerged in the late 1990s of systematic child slavery and trafficking on cacao plantations in West Africa.[9]

Slavery in the 21st century continues and generates $150 billion in annual profits.[10] Populations in regions with armed conflict are especially vulnerable, and modern transportation has made human trafficking easier.[11] In 2019 there were an estimated 40 million people worldwide subject to some form of slavery, 25% of them children.[10] Sixty-one percent[nb 1] are used for forced labor, mostly in the private sector. Thirty-eight percent[nb 2] live in forced marriages.[10] Other types of modern slavery are child soldiers,trafficking, and slavery.

Explanation:

Because the discoveries were some of the oldest human remains.