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Answer:
The United States broke diplomatic relations with Germany, because Germany declared unrestricted submarine warfare against all ships.
The correct answer is C.
The correct option is C). Germany declared unrestricted submarine warfare against all ships.
When did the US break off relations with Germany?
Germany started a warfare on the ships of the US and made an attack on the on passenger and merchant ships in 1917, which became the primary reason for their breakup.
On January 31, 1917, Germany announced a policy of unrestricted submarine warfare due to which the United States cut all the diplomatic ties with Germany.
Basically, Unrestricted submarine warfare was the reason why the United States break diplomatic relations with Germany.
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