They made this to preserve and protect themselves from the wars in the world. President Woodrow Wilson motivated the Americans to stay neutral as it is called safe democracy. He decided not to let Americans get involved in the wars of other nations. He also stopped providing military assistance to show his neutrality.
Areas like the Indus Valley Civilization (India), Egypt and China developed advanced civilizations first. Yes, geography played an important role. All of these civilizations had large rivers to support agriculture, Indus river in Indus Valley Civilization, Nile river in Egypt and Yellow river in China.
Answer: These tribes were commonly referred to as Barbarians.
Explanation: