Final answer:
The sinking of US ships, the Zimmerman Telegram, and the fear of Germany's victory and Bolshevik power contributed to the realization of the United States' involvement in World War I.
Step-by-step explanation:
The United States' involvement in World War I became imminent due to several factors. Firstly, the sinking of US ships by German submarines, such as the Lusitania, created a sense of injured honor among Americans. The sinking of US ships, the Zimmerman Telegram, and the fear of Germany's victory and Bolshevik power contributed to the realization of the United States' involvement in World War I.
Additionally, the Zimmerman Telegram, which proposed a military alliance between Germany and Mexico against the US, further pushed public opinion towards intervention. Furthermore, the fear that Germany might prevail and the Bolsheviks might seize power in Russia led some Americans to believe that US entry into the war was necessary to bolster the morale of Britain and France.