Final answer:
The U.S. entered World War I due to the Zimmermann Telegram, strategic concerns with the likelihood of a German victory and the rise of Bolsheviks in Russia, Wilson's principle of neutrality and the freedom of the seas, and Wilson's idealistic vision for a postwar world, including the League of Nations.
Step-by-step explanation:
Reasons for U.S. Involvement in World War I
The involvement of the United States in World War I was the culmination of several factors:
Zimmermann Telegram: This was a secret communication from the German Empire offering a military alliance with Mexico against the U.S. in case of war. The proposal included promises of the return of territories lost to the U.S. such as Texas, New Mexico, and Arizona.
Mixed Public Opinion: While a small volunteer army and domestic challenges such as resistance from Irish and German Americans complicated matters, strategic considerations pushed towards engagement due to the increased likelihood of German victory and the rise of Bolsheviks in Russia.
Principle of Neutrality: President Woodrow Wilson's principle of neutrality and commitment to the freedom of the seas conflicted with Germany's wartime activities, making neutrality increasingly difficult to maintain.
Wilson's Idealism: Wilson envisioned a postwar world and the formation of the League of Nations, calling for the U.S. to serve as a moral compass and support the well-being of democracy without seeking wealth or territory.
These elements, combined with the broader context of the war and American strategic interests, contributed to the United States entering the war on the side of the Allies.