Answer: Germany
Explanation: Germany seting the comands of unrestricted sumbarine warfare was one reason, unrestricted sumbarine warfare sunck any ships aiding the allies. A nother factor was the Zimmermann Telegram which germany sent to mexico to invade the united states.
I believe it is B. Pls give brainlist
Answer:
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Don't put unnecessary questions.
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The answer is A. Just took the test !