The correct answer to this open question is the following.
More advanced civilizations were able to develop technology that allowed their citizens to move away from the river and protected them from flooding.
This technology first, allowed civilization to predict the flooding of the rivers, and then to take advantage of the flooding to increase crop production.
Let's not forget that ancient civilizations such as Sumeria, settled in the middle of two rivers: the Euphrates and Tigris. This represented many advantages to farming but also had its risks, basically, flooding. In the case of ancient Egypt, they settled in the banks of the Nile River, and they were one of the most successful civilizations that developed the kind of technology to avoid disasters due to flooding, and instead, growing good crops. The flooding of the Nile left rich soil to grow quality crops that they traded with other towns. The Egyptians also built underground channels to take the course of the water in times of flooding. Thes minimized the risk of massive flooding of their cities.
Europe was stuck in the dark ages while African kingdoms and empires rose to power and reach the height of its power. After the decline of Nubia and Egypt at this time the African kingdoms experienced its golden age and continental renaissance feeling and the development of their economy especially in trade and commerce.
The first African-Americans brought into English America do not do so as slaves, but as registered laborers, but in 1650 it is almost impossible for them to obtain freedom: Europeans need cheap and submissive people in the colonies, which causes settlers to be inclined to slavery. In Maryland, Delaware, and Virginia slavery is legalized first. North, New England does not need to have slaves for its traditional and puritan way of life, Nor the intermediate zone formed by New York, Pennsylvania, Delaware, New Jersey, with population of English, German and Dutch merchants and farmers, less racist and more tolerant. But in the South it was different, in the Virginias, the Carolinas, Maryland, Georgia, plantations and landowners needed massive numbers of people, leading to a system of slave control, and an accepted racist ideology.
Lindbergh<span>, </span>Charles<span> Augustus made the first solo nonstop flight across the Atlantic Ocean on </span>May 20<span>, </span>1927<span>.
hope this helped</span>
