A: To show a contrast.
What is show?
The term "show" means to be able to exhibit as a result of one's work or expenditure.
What is contrast?
The term "contrast" means to happen when the two things are just very different. For example, cats and dogs are definitely a contrast, but they're not opposites.
It is so because it is depicting the contrast through the older times and present time.
To learn more about contrast here
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