Final answer:
Woodrow Wilson was the U.S. president during World War I.
Step-by-step explanation:
The U.S. president at the time of World War I was Woodrow Wilson. He served as the 28th president of the United States from 1913 to 1921. Wilson played a significant role in leading the country through the war, including the decision to enter the conflict in 1917.
Learn more about World War I and U.S. presidents