Germany needed to break the deadlock. The English had a blockade keeping valuable resources they were keeping from Germany. Germany used the subs to end this by attacking passenger ships forcing the British to stop.
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Answer:
I don't know I'm sorry I will tell you another answer asks me
<span>United States scandal involving members of President Andrew Jackson's Cabinet and their wives. </span>
Basically it is the right to refuse answering a question if you believe it is to incriminate oneself.
The kingdoms of Ghana, Mali, and Songhai prospered primarily due to their "<span>(1) exchanges with Indian ports" but it should be noted there were other factors. </span>