Answer:
There were several events that led to the U.S. decision to abandon its policy of neutrality and enter World War I on the side of the Allies. These included:
The sinking of the Lusitania: A British passenger ship that was sunk by a German submarine in 1915, resulting in the deaths of 128 Americans. This event caused outrage in the U.S. and increased pressure on the government to take action against Germany.
The interception of the Zimmermann Telegram: This was a telegram sent by the German foreign secretary in 1917 that proposed a military alliance between Germany and Mexico against the U.S. The telegram was intercepted and made public, further inflaming tensions between the U.S. and Germany.
The unrestricted submarine warfare campaign: In 1917, Germany resumed its campaign of unrestricted submarine warfare, sinking several U.S. merchant ships. This led to the U.S. declaring war on Germany.
The Selective Service Act, also known as the draft, was a law passed in 1917 that required all male citizens and immigrants between the ages of 21 and 30 to register for military service. The act had a significant impact on Americans, as it required young men to potentially leave their homes, families, and jobs to serve in the military. The act also resulted in widespread protests and resistance, as many Americans opposed the idea of being forced to fight in a foreign war.