Definition:

war hawk


noun1.hawk1 ( def.4) .
2.( initial capital letters) U.S.History. any of the congress men from the Southand West, led by Henry Clay and John Calhoun, who wanted war against Britain in the period leading up to the War of 1812.

Source: http://dictionary.reference.com/browse/war+hawks?s=ts

external image Henry_Clay.jpg
Portrait of Henry Clay
external image 220px-John_C._Calhoun.jpeg
Portrait of John Calhoun

They were both war hawks which means that they enjoyed fighting rather then finding democratic solutions.