Based on the map what may have prevented the anglican church from spreading beyond england

Isolation to an island--The Anglican Church or the Church of England remained on the island nation due to geographic isolation. 

The Anglican Church had the king/queen of England as the leadership of the Church. Becoming a member of the church would also create loyalty to the British royalty. In addition, the Church become one with the traditions of the monarchy in Britain and did not connect to other areas. 

The first obvious thing that would limit the spread of the Anglican Church was the English Channel. The very thing that protected England for centuries was also what kept the Church from spreading. The deeply ingrained Protestant beliefs of Lutheranism and Calvinism in northern Europe and the Catholic strongholds of France and Spain would also make things more difficult for the Anglican Church. The Church would only see growth once settlements and colonies were established in the New World. 

The author may use foreshadowing or the use of detailed wording of the sentences. They could make it so the event is completely a surprise or make it kind of expected. It happens in the climax of the story or article. It could include the use of pictures or illustrations.

hope this helps!