Answer:
The City upon a Hill is the belief that puritans were predestined and chosen by God. The first who propose this idea was John Winthrop, the founder of the Massachusetts Bay Colony. To him, the new colony should be "The City upon Hill", that is, the people who were going to live there would be predestined, good ones, and would be governed with justice, to be fair and God-fearing, following His rules and commandments.
Step-by-step explanation:
It's an important idea because made the basis for the early development of the first colonies in America. Was the way to begin a new world with justice and God-fear. At first, the idea was good and made great results, but soon the population was growing, and a new generation was coming, this idea began to melt. The central point related to "The City upon a Hill" is the intolerance, and the necessity to maintain a status quo that was gradually disappearing.