The Truman doctrine demonstrated that the United States would not return to isolationism after world war 2 but rather take an active in affair

its many islands, high mountains, and remote peninsulas isolated population centers.

powers  are  denied  to the  national governmentin three distinct ways: some  powers, such as the  power  to levy duties on exports or prohibit the freedom of religion, speech, press, or assembly, are expressly  denied  to the  national government  in the  constitution.

i believe it would be capitalism

warfare was the primary means of cultural transmission in both regions.