Correct Answer - Option 4 : April, 1917
World War I broke out across Europe in 1914.
- President Woodrow Wilson said that the United States would remain neutral, and many Americans supported this policy of non-intervention.
- However, public opinion about neutrality started to change after the sinking of the British ocean liner Lusitania by a German U-boat in 1915. In this accident, almost 2,000 people died, including 128 Americans.
On April 2, 1917, Wilson went before a special joint session of Congress and asked for a declaration of war against Germany, stating: “The world must be made safe for democracy.”
- On April 4, the Senate voted 82 to 6 to declare war.
- Two days later, on April 6, the House of Representatives voted 373 to 50 in favour of adopting a war resolution against Germany.
- In early 1917, the U.S. Army had just 133,000 members.
- That May, Congress passed the Selective Service Act, which reinstated the draft for the first time since the Civil War and led to some 2.8 million men being inducted into the U.S. military by the end of the Great War.
- Around 2 million more Americans voluntarily served in the armed forces during the conflict.
- The first U.S. infantry troops arrived on the European continent in June 1917.
- In October, the first American soldiers entered combat in France.
- That December, the U.S. declared war against Austria-Hungary (America never was formally at war with the Ottoman Empire or Bulgaria).
- When the war concluded in November 1918, with a victory for the Allies, more than 2 million U.S. troops had served at the Western Front in Europe, and more than 50,000 of them died.
Thus, it is clear that the USA entered in First World war in April 1917.