How did Woodrow Wilson promote his peace plan ?
After the end of WWI, President Wilson tried to promote his peace plan in the US through direct appeals to the people.
Wilson had encountered a great deal of opposition in the Senate. By some accounts, the Senators who were obstructing his plans just wanted some amendments that would satisfy worries that they had about the League of Nations. But Wilson was not inclined to compromise. Therefore, his strategy for promoting his peace plan was to take a tour of the US, making speeches on the issue. He hoped to directly persuade the people to back him. The people, he hoped, would then put pressure on the Senate to support Wilson.
We cannot know if he would have succeeded. Wilson suffered a stroke a few weeks into the tour and was incapacitated for a long time. During that time, the Senate rejected the Treaty of Versailles.