Which of these was a factor in the U. S entry in World War 1?

In early 1917 Berlin forced the issue. Its declared decision on 31 January 1917 to target neutral shipping in a designated war-zone became the immediate cause of the entry of the United States into the war. Five American merchant ships went down in March.

Explanation:

the USA entered World War I because Germany had sunk a ship with US passengers, the Lusitania, after an agreement that neither would attack in the sea warzone.

Another factor that caused the USA to enter World War I was the Zimmerman Telegram, Germany sent a coded telegram to Mexico in hopes of getting Mexico to ally with them and turn against the USA.

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Explanation:

a) "how old man winter was driven back " and "ormuzd and arimanes"

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