Answer: Migration (B)
Explanation: It's not population growth because it means the increasing population of a place.
Not immigration because it means coming to live in another country permanently.
And lastly, not deportation because it means the removal of a foreigner for violating an immigration law
The correct options are: <em>strengthen national defense</em> and <em>supply more raw materials. </em>
American people believed that the more military bases the Unites States had outside the country, the better. It was believed that those bases would help the government to improve the national security.
On the other hand, international commerce all around the world would provide at a low cost the essential raw materials to the military forces.
