Final answer:
One of the earliest subject matters of photography was people walking on Paris Boulevards. French photographer Charles Nègre captured street scenes in Paris during the mid-19th century, showcasing the emergence of modern urban life.
Step-by-step explanation:
One of the earliest subject matters of photography was people walking on Paris Boulevards. This is particularly exemplified by the work of French photographer Charles Nègre, who captured street scenes in Paris during the mid-19th century. Nègre's photographs showcased the emergence of modern urban life in Paris and the daily activities of its inhabitants, making them a significant contribution to the history of photography.
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