Argentina, Brazil and Chile met in Niagara Falls, Canada, to mediate and prevent war between the United States and Mexico. The two countries had experienced increasing tensions after the Tampico Affair and the United States' occupation of Veracruz. Frederick William Lehmann and Joseph Rucker Lamar represented the U.S. at the conference.
Editors. "Argentina, Brazil and Chile arbitrate between U.S. and Mexico". The Literary Encyclopedia. First published 01 March 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=12181, accessed 21 May 2013.]