How did early hunter-gatherers affect the physical environment? They spread seeds when they farmed new areas.
They contributed to a decline in animal populations.
They mined metals to make arrowheads and spearheads.
They used fire to destroy forests across large regions.

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.

The led the formation to the united states

The amendment process.