Why did the united states break diplomatic relations with germany in 1917?
a) germany refused to accept president wilson’s fourteen points.
b) germany signed the treaty of brest-litovsk with russian bolsheviks.
c) germany declared unrestricted submarine warfare against all ships.
d) germany sank the british liners lusitania and arabic in quick succession.
e) germany offered to mexico recover texas, new mexico, and arizona

The correct answer is E) Germany offered to help Mexico recover Texas, New Mexico, and Arizona.

Even though the Germans did sink the British passenger ship (the Lusitania), this event took place in 1915. The event that took place in 1917 that caused tension between the US and Germany is represented by letter choice D. Germany's offer to help Mexico to gain back territory lost to the United States during the Mexican American War was supposed to be received by the Mexican government. However, this message was intercepted by Allied forces who informed America of Germany's plan. This famous message, known as the Zimmerman Telegram, was exposed to the public in March of 1917. This resulted in the United States declaring war on Germany and allowed for the official entrance of the US into World War I.

d. she conquered the black sea coast and parts of poland.