Final answer:
The subject of the question is English, and it pertains to historical exploration and discovery.
Step-by-step explanation:
The subject of the question pertains to English. The phrase 'set sail into the____' suggests a historical context, where daring adventurers embarked on journeys that would change the course of history. The question is about the exploration and discovery of new lands and civilizations, which is a common topic in English literature and history.
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