More settlers moved westward after the war of 1812 for the following two reasons:
more jobs were available out west
there was plenty of cheap land
peace had been made with the indians
travel to the west was easy
! you in

The correct answers are:

- There was plenty of cheap land;

- Peace had been made with the Indians;

The westwards migration and settlement was triggered by few things, like the cheap land, peace with the Indians (well, with most of them), and government motivation and actions.

The government wanted to make people move westwards so that they can get hold of more territory, and they lured people by giving them land for free and land for very low amount of money, and we are talking about very big peaces of land. The people embraced the opportunity to become big landowners and they rushed to settle in the west in order to get the biggest and best pieces of land. Also, a major factor was the safety, and once there was peace with most of the Indian tribes, it was safe enough to move there and not be worried about getting killed.  

either b) they were often feared and despised by other native cultures. or

c) their obsession allowed them to coexist with many other native cultures because of their peaceful nature.

in the 1800s, locomotives powered by steam made transportation faster and cheaper. the resulting rapid growth of railroads led to the connection of the atlantic and pacific railroad in oklahoma city in 1897.

in the last years of the century, the improvement of steam-based engines the expansion and growth of railroads. this growth increased when the companies started to build and expand, such as the atlantic and pacific railroad, which connected new mexico with california, and missouri with oklahoma. many of these new networks were built in oklahoma, and these changes transportation henceforward.