The is a process wherein people have been compelled to move from rural areas and have been attracted to cities due to a variety of economic changes.

I believe the answer is: Urbanization

Urbanization started to occur ever since the industrial revolution period. Before the industrial revolution, most jobs were located on rural area since most of the jobs were related to farming. After industrial revolution, manufactures provide the largest job opportunities, which make it shifted to urban area.

i believe that the answer to the question provided above is that the role of campaign committees is to act as a bridge between state and local campaigns.