Sodbuster is a slur used to describe Americans in a derogatory way. People moving to the Midwest built their homes out of thick sod, since no other building material was available. They also had to break up the sod to plant crops.
The word Sodbuster is a racial slur that has been used historically to degrade and dehumanize americans. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to americans. If you are unsure about whether or not it is appropriate to use the word Sodbuster, it is best to err on the side of caution and avoid using it in any situation.