Niagara Falls peace conference

The Niagara Falls peace conference, sometimes referred to as the ABC Conference, started on May 20, 1914, when representatives from Argentina, Brazil and Chile—the ABC Powers—met in Niagara Falls, Canada, for diplomatic negotiations in order to avoid war between the United States and Mexico, during the era of the Mexican Revolution.

There were increasing tensions between the two over the Tampico Affair of April 9, 1914 and the subsequent United States occupation of Veracruz of April 21, 1914 during the Mexican Revolution. The Mexican and American governments had severed all diplomatic channels between one another. At the conference, Domício da Gama represented Brazil, Rómulo Sebastián Naón represented Argentina, and Eduardo Suárez Mujica represented Chile.

The United States was represented by Frederick William Lehmann, a former United States Solicitor General; and Joseph Rucker Lamar, an Associate Justice of the Supreme Court of the United States. On May 27, 1914 to celebrate their success, the ABC envoys and the U.S. and Mexican delegates to the conference attended a royal garden party given by the Duke of Connaught, the Governor General of Canada at the King Edward Hotel.