The event surrounding World War I that had the GREATEST impact on Americans was B the sinking of the Lusitania.
The sinking of the Lusitania in 1915, where a British ocean liner was torpedoed by a German U-boat, resulted in the deaths of many American passengers and heightened anti-German sentiments in the United States. It played a significant role in shifting public opinion against Germany and increasing calls for the U.S. to enter the war. While other events also influenced American involvement, the Lusitania incident is often highlighted for its direct emotional impact on the American public and its role in the eventual decision to enter the war.