It would be primarily "The Church and the Crusades" that <span>played a significant role in uniting the kings and people of Europe, since adhering to religious principles back then was the norm for most. </span>
1 is the answer to your question.
13. Im not too sure but I would guess (E)
14. (D)
hope this helped
can you relate to the attachments???
Their isnt an diagram can u plz show it?
Humans must have external constraints in order to live together