United States declaration of war upon the United Kingdom
An Act Declaring War between the United Kingdom of Great Britain and Ireland and the Dependencies Thereof and the United States of America and Their Territories was passed by the United States Congress on 18 June 1812, thereby beginning the War of 1812.
Text of the declaration
Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, That war be and is hereby declared to exist between the United Kingdom of Great Britain and Ireland and the dependencies thereof, and the United States of America and their territories; and that the President of the United States is hereby authorized to use the whole land and naval force of the United States to carry the same into effect, and to issue to private armed vessels of the United States commissions or letters of marque and general reprisal, in such form as he shall think proper, and under the seal of the United States, against the vessels, goods, and effects of the government of the said United Kingdom of Great Britain and Ireland, and the subjects thereof.
- http://avalon.law.yale.edu/19th_century/1812-01.asp Retrieved 2010-13-7