Which of the following documented the uniting of the States, and caused the British to begin the war?

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.

Their solution was to tax the colonists. 

It is a rice industry