What is the difference between unity and variety?

Variety is the use of different visual elements throughout a work, whereas unity is a feeling that all the parts of a work fit together well. These do not have to be opposites, as a work filled with variety might also have unity.

The region of the united states where beef and hog production is prevalent is the midwestthere are 12 states in this area including  illinois,  indiana,  iowa,  kansas,  michigan,  minnesota,  missouri,nebraska,  north dakota,  ohio,  south dakota, and  wisconsin. all of these states are known for their meat and such products. 

Juan sanchez hope it will !