Many people consider fear to be the most influential factor in Mitchell Palmer's campaign.
Answer:
Germany's resumption of submarine attacks on passenger and merchant ships in 1917 became the primary motivation behind Wilson's decision to lead the United States into World War I.
"Its<span> location limited its contact with other advanced cultures" would be the best option from the list, since a system of boundaries made it inadvantageous for people to both come and go from the territory. </span>
