Answer :
Final answer:
The United States officially entered World War I on April 6, 1917, following a shift in public sentiment and key events like the sinking of the Lusitania and the Zimmerman Telegram. President Wilson's declaration of war reflected a move away from isolationism. The entry of the U.S. into the war had significant impacts both internationally and domestically.
Explanation:
United States Entry into World War I
World War I began in Europe in the summer of 1914, but the United States officially entered the conflict on April 6, 1917. President Woodrow Wilson, who had been firmly against the war initially, changed his stance due to several incidents that inflamed American public opinion, including the sinking of the Lusitania and the Zimmerman Telegram.
By early 1917, submarine warfare had resumed, leading to significant American casualties and provoking outrage. On April 4, Congress declared war on Germany, citing the need to protect American interests and values. This marked a significant shift in U.S. foreign policy from isolationism to global involvement as the nation prepared to send troops to aid the Allies in Europe.
