Which of the following is true? asia attracted the greatest migration of humans. by 18,000 bce, half of all humans migrated to the americas. in 18,000 bce, all humans remained in africa. humans had spread to each continent by 18,000 bce.

During the decades between world war i and world war ii, american foreign policy was characterized by a) large-scale military mobilization in anticipation of the second world war. b) aggressive imperialism as the united states gained control of much of the pacific. c) increasing federal control of the american economy to battle the effects of the great depression. eliminate d) increased isolationism as the united states focused on domestic issues instead of involvement in international affairs.