If your question is: What was the reason behind the incident described in this passage? a. Ethnic conflict in the Ottoman empire b. Extreme militarism in Germany c. Serbian nationalism d. Economic competition between France and Germany
I think the answer is d. Economic competition between France and Germany.
Members of the Immigration Restoration League "wanted to restore the U.S. to its former glory." They believed that most of the immigrants coming into the United States were racially inferior to whites.