Answer:
because the United States is the number 1 country in the world in the military field, therefore America needs oil resource to drive vehicles like tank, battleship, and plane
I believe the answer is the Montessori method.
I was educated in this way myself so I believe that's the right answer :)
<span>At the dawn of the American Revolution, 20 percent of the population in the thirteen colonies was of African descent</span>