They did not lead to war; they were part of the war. They were, however, factors in the United States' decision to enter the war.
the zimmerman note was passed .
Many events led up to it, but the triggers that started it were the sinking of the Lusitania, and the assassination of Archduke Ferdinand.
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The Sinking of the Lusitania and the Zimmerman telegram.
the zimmerman note was passed .
The sinking of the Lusitania ( a ship which had 4 American's on board), and the Zimmerman telegraph to Mexico (which was intercepted requesting Mexico's participation in attacking the US), convinced the powers that be to take part in the war.
Germany's practice of unrestricted submarine warfare that led to the sinking of the Lusitania and the Zimmerman telegram, in which Germany promised Mexico its old lands in California, Arizona, and New Mexico if Mexico attacked the United States all led to the United States' entrance into World War I.
The Germans used submarines to attack Passenger ships, most notably the Lusitania, as well as US supply ships. The Germans also tried to convince Mexico to ally against the USA, as evidenced by the "Zimmerman letter."
sinking of lusitania
the Lusitania was a british passenger liner that had Americans on board when she was sunk, not sure of another one. the zimmerman note was also a major cause. In it, the Germans attempted to convince Mexico to attack the united states from the south in order to create another front. the US was still neutral at the time the note was sent but they did not stay that way for long.
German subs sinking the Lusitania and the Zimmermann Telegram.
Many events led up to it, but the triggers that started it were the sinking of the Lusitania, and the assassination of Archduke Ferdinand.
The Zimmerman Letter
America declaring war on Nazi Germany and joining the Second World War in Europe.
Unrestricted submarine warfare by Germany during World War I was a significant factor in the US entry into the war. The sinking of American civilian ships, such as the British liner RMS Lusitania in 1915, which resulted in the loss of American lives, created public outrage in the United States. This, combined with intercepted German communications proposing a military alliance between Germany and Mexico, known as the Zimmerman Telegram, ultimately pushed the US to declare war on Germany in 1917.