Respuesta :
The Zimmermann Telegram's implied threat of a German attack on the United States, swayed U.S. public opinion in support of a declaration of war.
Americans entered the war in 1917 by declaring war on Germany. This was due to the attack on Lusitania, the unrestricted submarine warfare on American ships heading to Britain, and Germany encouraging Mexico to attack the USA.
A German U-boat had sunk the British passenger ship the Lusitania at great loss of life. Unrestricted submarine warfare was suspended following public outcry in the US, but was reinstated in 1917. This eventually led to the American declaration of war on Germany.
a German submarine sank the British ocean liner Lusitania, resulting in the deaths of nearly 1,200 people, including 128 Americans. The incident strained diplomatic relations between Washington and Berlin and helped turn public opinion against Germany.
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