Something that I think is important to remember is what economic forces drove slavery. Early on, most slaves were used for mining or as part of the encomienda system (a kind of feudal tributary system with Spanish encomenderos ruling over Native Americans). These slaves were largely Native American because it was easiest to draw labor from near by and the available population largely met the labor demand. Also, the encomienda system fit nicely with the tribute systems already in place in many meso-american societies (although the Spanish drove these systems to an obscene conclusion). This system eventually failed for the reasons you point out.
I think there is a fourth reason for the decline of Native American enslavement. Tribute and mining were no longer seen to be as lucrative as they once were. The real money in colonization was seen as sugar. And this commodity, which required extensive labor, was the major force behind slavery. When you look at where slaves were sent, the biggest destinations were Brazil, Cuba, and other big sugar producers. But by the time the sugar industry picked up, Native American slaves could not meet the labor demands, while African slaves could be easily bought from West Africa for guns, steel, and other goods.
As you mention, many West African states were already players in the slave trade but it wasn't until sugar exploded that there was a European demand for these slaves. Initially, European traders were most interested in extracting gold (this may have been due in part to mercantilism and similar economic theories at the time). Take for example the Gold Coast, which was originally named for its gold mines and gold trade, but by the 1800s hosted one of the biggest slave castles at Elmina (the mine).
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Answer and Explanation:
Mesopotamian civilizations were formed on the Tigris and Euphrates rivers in what is now Iraq and Kuwait. The first civilizations began to form around the time of the Neolithic revolution - 12000 BC.
The evidence shows extensive use of technology, literature, legal codes, philosophy, religion, and architecture in these societies.
About 6000-8000 years ago, agriculture was well established around the Nile in many areas, including ancient Egypt; The Indus Valley Civilization; Between Mesopotamia, the Tigris and Euphrates rivers; And along ancient China, the Yellow and Yangtze rivers. Mesopotamia - mainly Iraq or modern-day Kuwait - in particular, is often referred to as the cradle of civilization because some of the first city-states and most influential empires first emerged there, although it is not the only place! Its common name derives from the Greek for Medio - Mesos - and river - Potamos - and means a "country between two rivers." Those two rivers are the Tigris and the Euphrates.
Associated with Mesopotamia are ancient cultures such as the Sumerians, the Assyrians, the Akkadians, and the Babylonians. In this period, time can be a little confusing because these cultures have interacted and governed each other over for several thousand years. These terms may also be associated with city-states, languages, religions, or empires, depending on the time and context we are observing.
Answer: During this era, television became the predominant form of mass media because of the increased frequency with which families would watch it.
