The political doctrine, which flourished in the nineteenth century, claiming that the benefits of democracy would flourish along with territorial expansion

This doctrine is called Manifest destiny. It also stated that the expansion of the settlers into the new world is inescapable and will happen at some point regardless.

This is called Manifest Destiny, this is the belief that settlers were destined to expand across North America, and by doing so democracy would flourish along with expanding their territory.

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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.