Answer:
He embarked on a railway speaking tour across the united states ( C )
Step-by-step explanation:
President Wilson was a pioneer of the league of nations whose main objective was to restore world peace. it was part of the treaty of Versailles that was signed at a peace conference in Paris that saw the end of the world war 1.
The league of Nations needed to be voted on whether it would be accepted or not by the senate according to American laws. President Wilson in order to get public support that will push the hands of the senate to vote in favor of the treaty he embarked on a railway speaking tour across the united states with the aim of getting the American people to support it.