Woodrow Wilson

Woodrow Wilson won the U.S. presidency in 1913 with the slogan “He kept us out of war”. Nevertheless, Wilson changed course and plunged the U.S. into that conflict on April 6, 1917. Approximately 270,000 Americans were killed or injured. Over 1200 American citizens who opposed the war were rounded up and imprisoned, sometimes for years.

Weir p. 15. 1200 imprisoned: Note 62 p. 120 f: Wilson‘s Espionage and Sedition Acts resulted in the jailing 1,200 Americans. Bill Kauffman, Ain’t My America: the Long, Noble History of Antiwar Conservatism and Middle American Anti-imperialism (New York: Metropolitan, 2008), p 74.

Several reasons have been given for Wilson‘s change of course, including Germany‘s submarine warfare and the sinking of the American passenger ship Lusitania. Historians also add pro-British propaganda and economic reasons to the list of causes, and most suggest that a number of factors were at play.

According to the William Yale Papers of 1916-1972, Zionism appears to have been a factor

As a result of the Allied victory, due in large part to the US, the League of Nations Mandate for the British included Mandatory Palestine. The British were persuaded to issue a statement supporting the establishment of a Jewish state in Palestine, resulting in the “Balfour Declaration”, despite the fact that native Palestinians already made up more than 90 percent of the population.

American Jewish Thought Mosaic
https://scholar.harvard.edu/files/martinkramer/files/the_balfour_declaration_and_the_jewish_threat_that_made_britain_honor_it_mosaic.pdf

The Balfour Declaration laid waste to a previous British-Arab correspondence, the McMahonn Hussein Correspondence, dated from July 1915 to January 1916, which would have allowed for an independent Arab state in Palestine.

https://internationalrelations101.com/the-mcmahon-hussein-correspondence