Two reason members of a group may have diffivulty agreeing on a issue

1.) They have different views
2.) They were raised differently
3.) They want to do what's best in their mind.
(You choose your response!)

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.