51st Stater is a slur used to describe Canadians in a derogatory way. Canada is so culturally similar to the U. S. that they are practically the 51st state
The word 51st Stater is a racial slur that has been used historically to degrade and dehumanize canadians. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to canadians. If you are unsure about whether or not it is appropriate to use the word 51st Stater, it is best to err on the side of caution and avoid using it in any situation.