The New England colonies relied on trade and farming as their economy.
Either the Crusades or Polo's journeys.
I assume, you mean an Arab country?
Many Arab countries were not really affected, but only had minor protests, such as Saudi Arabia, Oman, Djibouti, Palestine, Somalia and Lebanon
Answer:
Letters and publications written by Nazi leaders before the Second World War.
Explanation:
This answer is correct because this historian is searching for the motives of these perpetrators, letters and publications can tell their thoughts and conversations.