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
The Zimmermann Note, submarine warfare
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.
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.
Japanese attack on pearl harbor in 1941
1. Allying itself with Austria-Hungary. 2. Declaring war on England and France.
Two key actions by Germany that prompted the United States to enter World War I were the unrestricted submarine warfare and the interception of the Zimmermann Telegram. The German U-boats targeted and sank ships, including those carrying American passengers, which escalated tensions. Additionally, the Zimmermann Telegram revealed Germany's proposal to Mexico to join the war against the U.S., further inflaming public sentiment and prompting the U.S. to declare war in April 1917.
the catylist that caused America to enter world war two was the bombing of pearl harbour.
German supremacy over Europe.
M. J. Whitley has written: 'German coastal forces of World War Two' -- subject(s): Fast attack craft, German Naval operations, History, Naval operations, German, World War, 1939-1945 'Destroyers of World War Two' -- subject(s): Naval operations, Destroyers (Warships), Encyclopedias, World War, 1939-1945, History 'German cruisers of World War Two' -- subject(s): Cruisers (Warships), German Naval operations, Germany, Germany. Kriegsmarine, History, Naval operations, German, World War, 1939-1945 'German capital ships of World War Two' -- subject(s): Battleships, German Naval operations, History, Naval operations, German, World War, 1939-1945 'Cruisers of World War II'
no, Russia entered the world war two because Germany broke the alliance between them (when the German Army invaded Russia)
Adolf Hitler.