How did the building of the railroads affect people's ability to travel?

People could now go farther away from home AAAPPEEEXXX

the united states began searching for a way to reduce oil

-agarvated

i believe it would influence their own way of understanding things. it shall be a foundation where they can draw or start an argument.   historians are also  scientists that  have their tools of analysis and expertise to unlock a variety of difficulties such as relationships of man, origin, politics, economy, and culture. based on facts and understanding on these areas, they may shade light to extract ideas and develop options to validate a hypothesis or debunk it.