Question

Which of the following is NOT a reason the United States entered Unrestricted submarine warfare

a) The Zimmerman Note
b) The sinking of the Lusitania
c) Attacks on US colonies

Answer 1

The United States entered unrestricted submarine warfare in World War I due to the Zimmerman Note, sinking of the Lusitania, and Germany's unrestricted submarine warfare, but attacks on US colonies were not a reason.

Step-by-step explanation:

The United States entered unrestricted submarine warfare in World War I due to several reasons, but one reason that did not lead to its entry was attacks on US colonies. The primary reasons for the US entry were:

1. The Zimmerman Note: The interception of the Zimmerman Telegram, in which Germany proposed an alliance with Mexico against the US, added to the sentiment that the United States was honor bound to respond with military force.
2. The sinking of the Lusitania: The sinking of this British passenger ship, which carried American citizens, by a German U-boat in 1915 resulted in the death of 128 Americans and outraged public sentiment in the United States.
3. Germany's unrestricted submarine warfare: Germany's declaration of unrestricted submarine warfare on all Atlantic traffic, including unarmed American freighters, led to the sinking of several US ships and increased pressure on President Wilson to declare war.