Question

How did the building of the Transcontinental Railroad support Manifest Destiny?

The railroad made the assimilation of the Native American tribes in Indian Territory easier.
The railroad brought more people to the West, which pushed the government to help citizens settle more land.
The railroad helped move goods from the West to markets in the East, fueling the nation’s economy.
The railroads provided employment to many early settlers, enabling them to improve their standard of living.

Answer 1

I would say 
the railroad brought more peope toe the west...

Answer 2

The building of the Transcontinental Railroad support Manifest Destiny because The railroad helped move goods from the West to markets in the East, fueling the nation’s economy. This helps the economy grow because of many traders to come using the railroad system.