Cities serve the interests of while counties serve the interests of
a. the state/the federal government
b. the state/their residents
c. their residents/the state
d. charters/townships

The answer would be : C. Their residents/the state

The cities obligation usually involved in : managing the crimes in the city neighborhood, taking care of the city's public utility, and etc

Meanwhile , a county is some sort political geographic sub-division of a state which helps each of its state in its political matters

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.

The answer is a.     hope this !