Germany resorted to submarine warfare:

Question

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Germany resorted to submarine warfare primarily as a strategic effort to counteract the British naval blockade, which was significantly impacting Germany's ability to trade with the outside world, including the Central Powers. The blockade was restricting the flow of military supplies and civilian goods, leading to shortages and economic difficulties in Germany. Submarine warfare, particularly unrestricted submarine warfare, was seen as a way to break the blockade by sinking British and allied merchant ships, thereby undermining the British economy and war effort.

Germany Resorted to Submarine Warfare