From Dreams of a Great Small Nation: The Mutinous Army that Threatened a Revolution, Destroyed an Empire, Founded a Republic, and Remade the Map of Europe, by Kevin J. McNamara (PublicAffairs, 2016), Kindle Loc. 2257-2284:
That “the world must be made safe for democracy” remains perhaps the most famous of Wilson’s utterances, a line that reverberated then, as now, in one of the most highly regarded US presidential speeches of all time. It also elicited one of the most raucous outbreaks of applause in Congress. “Lansing’s argument was not lost on the president,” says diplomatic historian George F. Kennan. “The view he put forward not only found reflection in the message calling for a declaration of war, but soon became the essence of the official interpretation of the purpose of America’s war effort.”
ANOTHER FACTOR CONTRIBUTED to the White House’s push for a declaration of war: Emanuel Voska’s campaign to unearth and publicize the efforts by Austria-Hungary and Germany to finance espionage and sabotage inside the United States. Having returned to the United States, Voska waged a counterespionage campaign against spies and saboteurs of the Central Powers. Known as “Victor,” Voska managed eighty-four agents and supplied information to British and US intelligence while also operating a global intelligence and courier service for the Czech and Slovak independence movement. Historian Barbara W. Tuchman calls Voska “the most valuable secret agent of the Allies in the United States.” George Creel, the combative propagandist who led Wilson’s Committee on Public Information, called Voska “the greatest secret agent of the war.”
Vienna’s ambassador to the United States, Konstantin T. Dumba, was expelled in September 1915 after British intelligence intercepted—with Voska’s help—documents indicating that Dumba was conspiring to foment labor unrest among Habsburg subjects working at US steel and munitions industries. His successor was never formally accredited. German ambassador Johann von Bernstorff and two military aides, Captain Franz von Papen and Captain Karl Boy-Ed, were earlier implicated in schemes to violate American neutrality, including covertly supplying goods to German vessels, which invariably had Czech or Slovak crew members, and the two aides were also expelled. And there was the infamous Zimmerman Telegram, the leaked diplomatic communication named for the German foreign minister who offered Mexico the states of Arizona, New Mexico, and Texas in return for joining the Central Powers in a declaration of war against Washington. The telegram was given to the US government in late February 1917.
“These great political conspiracies,” Vojta Beneš wrote to Masaryk, “by which the official participation of Austria-Hungary and Germany in the crimes against American munition industries [has] been ascertained, have been exposed solely by Mr. Voska.” Beneš added, “Mr. Voska’s revelations had an immense influence on public opinion in America.” Diplomatic historian Betty M. Unterberger confirms this, saying, “During the early years of World War I, the two events which aroused the strongest public opposition to the Austro-Hungarian regime and at the same time engendered the greatest sympathy for the Bohemian liberation movement were the Dumba revelations and the Alice Masaryk affair.” The Czech and Slovak exiles exposed both controversies.