Final answer:
The subject of this question is English. The speech excerpt discusses the announcement made by the Imperial German Government regarding the use of submarines during World War I and emphasizes the need for nations to decide how to respond.
Step-by-step explanation:
The subject of this question is English. The given text is a speech excerpt, which is a common topic in English classes. In this particular speech, the speaker addresses the announcement made by the Imperial German Government regarding the use of submarines during World War I. The speech discusses the sinking of ships and loss of lives, and emphasizes the need for each nation to decide how to respond.
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