I think the best form of government to have in this situation would be an autocracy. I say this because the ruler would be able to order the upper classes to contribute to building the wall or donating money.
Hope this helps! Please let me know if I'm wrong :)
To answer the second question: Is your faith monothestic? Do you believe there can be more than one faith?
To answer the fourth question: What is your faith? What experiences have you had with internal differences and divisions within your faith? Consider this to answer that question.
Answer:
The Roman Catholic Church
Explanation:
Answer: Dutch West India
Explanation: The colony of New Netherland was established by the Dutch West India.