Answer:
By the mid-1600s, less than half a century after the English had opened the way for full-scale European settlement, serious crises were brewing in the American colonies. At first tensions were caused by a steadily increasing population: massive numbers of settlers required more land, additional dwellings and other accommodations, greater food supplies, and expanded trade and transportation networks. The immediate victims were Native Americans, who suffered mistreatment at the hands of colonists scrambling to grab land and natural resources. A demand for more laborers also created the institution of slavery, as millions of Africans were transported into the colonies during the seventeenth and eighteenth centuries. Among the colonists themselves, religious differences were escalating into confrontations, land squabbles were causing rebellions, and class divisions were breeding unrest.
Explanation:
When did the caste system evolve into a four tiered hierarchy?A.) when the Aryans ruled over the region - They arrived in 1500BC and developed the grouping of people based on their status and activities in life.
Akhenaten is the ruler who broke that practice. I think.
Rock n' Roll and Elvis Presley became popular in the 1950s through the rise of counterculture and young peoples desire for something new and rebellious. Elvis' music and rock'n roll more generally signified a shifting tide in American society amongst youth. Youth became interested in upsetting the status quo and listening and being involved in things that were once considered taboo like rock'n roll. Radio and TV helped to spread this music because it provided a medium for people to hear and learn of new artists and music styles quickly.
