Since I believe Emily Dickinson wasn't really religious, I would say that she writes that the church steeples "swam in Amethyst" to show that the church steeples represent wealth. Amethyst is green, just like money, so maybe she wanted to portray wealth in this way.
It is the very first line from the poem “Silver” by Walter de la Mare that best illustrates alliteration, mostly because in this line the author uses a variety of syllables.
This section took place at C.) in Canterbury
Propaganda and fear to scare the population into staying with them.