The author views world wars as harmful due to their divisive nature.
Fault lines in the context of wars represent divisions or weaknesses that exist as underlying causes of conflict.
The term fault lines in the excerpt from 'A Quilt of a Country' indicates that the author views world wars as harmful to people as they create divisions and tensions within societies.
By mentioning fault lines, the author suggests that world wars serve as sources of conflict and underline the divisive nature of such large-scale conflicts.
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