Hello, Jessie-- and welcome to English Forums. Since you say you are using biographies for text, you will be examining the language of the two authors--so what is the significance of the subject matter (the iconic women)? It is always interesting to compare the language of texts from different times (historical linguistics) or registers (sociolinguistics), but without further detail of what aspect of language you will be investigating, the topic you have presented seems rather bare of either interest or grist.
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