The main reason for the rapid settlement of the great plains was
(a) free land
(b) cash incentives
(c) the buffalo slaughter
(d) agricultural inventions

The main reason for the rapid settlement of the Great Plains was "(A) free land" although it should be noted that the land was not always free. It was always cheap, however.

the correct answer is d: "party organizers, volunteers, voters, and elected officials."

party organizers: individuals responsible for designing strategies in order to better execute the political campaign. this includes the candidate's public relations. volunteers: individuals responsible for raising awareness regarding the candidates running for office.voters: individuals who are convinced by volunteers that a particular candidate is the best option.elected officials: winning candidate and his elected team are a product of a successful political campaign.