How is "Pride and Prejudice" a social novel?

"Pride and Prejudice" faithfully reflects the social realities of the Regency Period (1811-20).

The contrasting lifestyle of different social groups is structurally central to a Jane Austen novel. In "Pride and Prejudice" the landed gentry represented by Darcy  is contrasted with the newly rich trading class represented by Bingley.

The novel was written against the background of the threat of an  invasion by Napoleon. The militia was a temporary voluntary force raised especially during times of a national emergency. Wickham was a member of this militia. Col.Fitzwilliam Darcy the younger son of an earl, on the contrary, is a fully commissioned officer of the regular army. In those days only an aristocrat or a member of the gentry could afford to purchase a commission in the army. In "Pride and Prejudice" Darcy purchases a commission for Wickham so that Wickham agrees to marry Lydia.

Jane Austen  portrays only the elegant aspects of Regency England. The seamy side,however, is  sometimes hinted at. Discipline in the army was very harsh and there is a report of a private being whipped. Similarly the prevailing poverty of the lower classes is revealed by the reference to poor feeding.

But most importantly the harsh reality of a bleak future  for a dependent unwed old woman is hinted at when Charlotte Lucas' brothers are relieved that Collins  is going to marry their sister, for otherwise they would have to look after her in her old age.