When we won world war 1 it gave a huge boost in American pride but indeed America still wanted to focus on itself. Most Americans felt that Europe could rebuild itself (which was horribly wrong and set things up for the rise of Hitler and the start of world war 2.). The American people also felt that Americans should not have to fight and die in foreign wars and that since they were across the Atlantic they didn't need to worry about their affairs.
Answer:
I guess you mean 30 year peace treaty?
The Thirty Years' Peace was a treaty, signed between the ancient Greek city-states Athens and Sparta, in the year 446 or 445 BCE.
Led China to become involved in the war
Answer
The problems the church faced during the invasion of the magyars and vikings include:
1. Simony: This involves selling church properties and sacred items.
2. Lay investiture: This deals with appointment of religious leaders by traditional rulers
3.Clerical marriage: Allowing clergymen to marry and it is different from allowing married men become clergy.
4.Celibacy: Abstaining from intimate activities.
5.Abuse of power in the hands of lay rulers.