It was actually one action, and one diplomatic overture.
Germany was attacking neutral US ships without warning, after promising not to. And in an apparent attempt to deflect the US, the Germans offered an alliance to Mexico, as detailed in the Zimmerman Telegram intercepted by the British.
The Germans sunk the Lusitania believing that it carried supplies to Britain as well as arms in order to help the war effort. It was carrying some American passengers when it was torpedoed, and this led to America joining the war. However, Germany may have been justified, as the ship may have actually been supplying Britain with much needed supplies in direct disregard of the sanctions imposed by Germany. In any effect, both the Lusitania and the Zimmerman affair swung American popular opinion in favor of interceding (effectively) in the conflict.
Read more: What_two_German_actions_caused_the_US_to_enter_World_War_1
Japanese attack on pearl harbor in 1941
Two key German actions that prompted the U.S. to enter World War I were unrestricted submarine warfare and the Zimmermann Telegram. Germany's resumption of unrestricted submarine warfare in early 1917 led to the sinking of American merchant ships, heightening tensions. Additionally, the interception of the Zimmermann Telegram, in which Germany proposed a military alliance with Mexico against the U.S., further inflamed public opinion and pushed the U.S. towards war.
Two key German actions that prompted the U.S. to enter World War I were unrestricted submarine warfare and the Zimmermann Telegram. The German navy's policy of sinking ships without warning, including those carrying American passengers, angered the U.S. Additionally, the Zimmermann Telegram, in which Germany proposed a military alliance with Mexico against the U.S., further inflamed American public opinion and pushed the U.S. toward war. These actions contributed significantly to the U.S. decision to join the Allies in 1917.
The Zimmermann Note, submarine warfare
It was a gradual process, but the German sinking of the Lusitania aroused furious denunciations of German brutality and allowed the US to enter the war.
Two key German actions that prompted the United States to enter World War I were unrestricted submarine warfare and the Zimmermann Telegram. The resumption of unrestricted submarine warfare in early 1917 threatened American shipping and lives, notably leading to the sinking of the Lusitania in 1915. Additionally, the Zimmermann Telegram, in which Germany proposed a military alliance with Mexico against the U.S., further inflamed public sentiment and pushed the U.S. towards war.
sinking of lusitania
Japan bombed pearl harbor
1. Allying itself with Austria-Hungary. 2. Declaring war on England and France.
cause they wanted to! =)
Since the German Empire wanted Mexico to help it to rage war against U.S., Mexico, in turn, will get back some of the land that she lost from the last century
France was invaded by German troops in 1940, surrendered on 24 June 1940.