As the united states acquired more land between 1803 and 1850, controversy ouer these territories focused on the

They started to focuses on the expansion of slavery

The transcontinental railroad provided a means of fast transportation. it cut a 6 month trip into 6 days, created jobs for many people and encouraged immigration. the homestead act played a huge role in western expansion; it allowed settlers to begin a fresh start, and gave them land in exchange for their residence for up to five years and a small fee.