Off topic: Avangi, well, I guess anybody can asnwer this question, I always wonder why Americans say yankees. Sometimes, they find it amusing. Why so?
Here's some history I found
The origin of
Yankee has been the subject of much debate, but the most likely source is the Dutch name
Janke, meaning "little Jan" or "little John," a nickname that dates back to the 1680s. Perhaps because it was used as the name of pirates, the name
Yankee came to be used as a term of contempt. It was used this way in the 1750s by General James Wolfe, the British general who secured British domination of North America by defeating the French at Quebec. The name may have been applied to New Englanders as an extension of an original use referring to Dutch settlers living along the Hudson River. Whatever the reason,
Yankee is first recorded in 1765 as a name for an inhabitant of New England. The first recorded use of the term by the British to refer to Americans in general appears in the 1780s, in a letter by Lord Horatio Nelson, no less. Around the same time it began to be abbreviated to
Yank. During the American Revolution, American soldiers adopted this term of derision as a term of national pride. The derisive use nonetheless remained alive and even intensified in the South during the Civil War, when it referred not to all Americans but to those loyal to the Union. Now the term carries less emotion
except of course for baseball fans.