Answer:
To promote transcontinental railroads.
Step-by-step explanation:
The transcontinental railroads were a project made by the United States government and the railroad companies to create one railroad that connected several states to create one large distribution chain,.
The used pamphlets, brochures, and magazines to spread the news about his project.
All of the advertising was made to attract private investors for the project, future consumers, and information about job openings for railroad workers position