Aprejudice differs from a stereotype in that it includes ​

It includes a negative emotional reaction that why a prejudice is different from a stereotype. Streotype is defined as a prejudgement of a person based on the group they're associated with while prejudice is the feeling that the person felt. So the answer in this question is a negative emotional reaction.

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.