There are 13 stripes in the American Flag. Which represents the 13 states.
At the beginning of the great war, many people were actually enthusiastic about the war (and at least supported it), which was fuelled by nationalism ( and the desire to prove themselves better than other nations) and perhaps hopes for territory gain; at the time it was not known that the Great War would come with such a great loss of life.
Answer: The Mayflower Compact
Separation of power, by making different branches he is dividing the power of the government into groups so that the different branches all work on seperate things and have there different places and parts in the government and it's decisions