Answer:
Correct answer is Woodrow Wilson.
Step-by-step explanation:
Wilson was a president of United States for two terms. Before the second term he even was using the slogan in his campaign that he kept the country out of war. As soon as the second term started United States entered the war.
Truman is not correct as became the president during WW2 when US will already involved.
Grant became a president after Civil War.
Taft was president before Wilson and WW1.