On Fri, 1 Jun 2012 21:17:43 -0700 (PDT), Chuck Gould wrote:

The San Juan Islands are part of the United States, rather than
Canada, due to consequences of clandestine British aid to the
Confederacy during the American Civil War.

Details: http://www.pacnwboat.com/issues/2012/67/mag/#/4/

no,

http://en.wikipedia.org/wiki/Pig_War

"Among the results of the treaty was the decision to resolve the San Juan dispute by
international arbitration, with Kaiser Wilhelm I of Germany chosen to act as arbitrator.
Wilhelm referred the issue to a three-man arbitration commission which met in Geneva for
nearly a year.[9] On October 21, 1872, the commission decided in favor of the United
States.[2][5][7] The arbitrator chose the American-preferred marine boundary via Haro
Strait, to the west of the islands, over the British preference for Rosario Strait which
lay to their east."