x1 is a Yank(ee); x1 displays Yankee culture/history in aspect x2 according to x3
Not necessarily pejorative, but probably fairly colloquial. It has the same semantic ambiguity as in English: it may refer to an American or something exhibiting American characteristics (especially a thoroughly patriotic American spirit), America as a colonial power, or a Unionist, or something pertaining/belonging to the northern states (or even more specifically, New England). See also: merko.