what is the term for an open, participatory style of government in which many different interests are represented?

Pluralism. An open, participatory style of government in which many different interests are represented.

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.