Explanation:
a )they help historians focus on the effect of one important idea on different societies over time
With the end of the Civil War came a great transition into a mechanized and factory-based economy, which took workers away from the farms and put them into the factories. Many people saw this is corporate great, which was in some ways true--this led to the formation of many unions and workers organizations.
Rhode Island. The colony of Rhode Island was founded by a puritan minister named Roger Williams, who was a strong advocate of a separation between church and state, as well as religious freedoms and tolerances among peoples. Originally, Roger Williams was a minister in Massachusetts but expelled in 1636 for having too radical ideas about religious freedom and separating government authority from religious practice. He then relocated to Rhode Island and set up a colony that guaranteed religious toleration and early advocacy for abolition of slavery.
