Sentence:  Here crashed a sturdy oath of stout John Bull,/ Who damned away his eyes as heretofore;/ There Paddy brogued “By Jasus!”—“What's your Wull?”/ The temperate Scot exclaimed; the French Ghost swore/ In certain terms I shan't translate in full,/ As the first Coachman will; and midst the roar/ The voice of <WSD>Jonathan</WSD> was heard to express,/ “"Our" president is going to war, I guess.”— 
Meaning of the word marked with <WSD> tags:  An American; a Yank; Brother Jonathan.