The black middle class was described as the households of three which had an income that falls between two thirds and double the median income.While the upper class was described to be the social group that had highest status .By the formulation according to the US income the upper class might be the fourth highest income quantile. That is the one above the middle but below the wealthiest.
In these cities such as New York, Chicago, and Cleveland t due to the economic growth the black middle and upper classes emerged.
Homo-sapiens began migrating from the African continent and populating parts of Europe and Asia. They reached the Australian continent in canoes sometime between 35,000 and 65,000 years ago. Hope this helps, Merry Christmas, and have a nice day
The Arno River (C) is an important river located in the Tuscan Region of Italy and was an important geographic feature which helped Florence to become a trade center.