Previously posted on this site in 2018, but some things never get old. This is newspaperman and statesman of confederation George Brown on talking to Americans... in 1852:
...when you get hold of a Yankee, drive it home to him; tell him his country is disgraced; wound his pride; tell him his pure institutions are a grand sham; send him home thoroughly ashamed of the black blot on his country's escutcheon. In steamboat, or railroad, or wherever you are, hunt up a Yankee and speak to him faithfully; there is no other man so sensitive as to what others think of him.
H/T Russ Chamberlayne, who first drew this to my attention.