Modernizations, Invention, mass migrations, culture
Early men lived in caves, used crude weapons for hunting and relied on gathering wild fruits for food. Today, man has built giant skyscrapers, uses the most-sophisticated technology for food production and lives in comfortable homes (Thomas, 1979). Everything developed in phases, first there was domestication of animals, then irrigation and farming as the need for food security grew, followed by inventions in the renaissance time and the industrial revolution that changed the modes of production.
Humans were also short in other areas such as medicine. A disease outbreak was enough to wipe out entire villages in time's past. Such outbreaks were responsible for mass migrations, particularly in Africa where outbreak of diseases such as smallpox triggered the migration of Bantu-speaking people from Zaire (Nurse, 1980). In the modern world, such diseases are no longer as scary. Modern medicine is so sophisticated that few diseases remain without cure.
In a cultural sense, culture has evolved so much that it is virtually unrecognizable. Bad practices such as female genital mutilations are now outdated. Borrowing of culture enables people to adopt features of other cultures beneficial to them (Nurse, 1980). This enables human culture to be more civilized and acceptable by other people, which promote unity.
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