The United States and the Soviet Union were the two competing powers of the Cold War
The Constitution was drafted in 1787, after the American Revolution ended. What document preceded the Constitution in outlining the powers of the US government? the Declaration of Independence.
My answer(simple) : The Ancient Greeks gave us the idea of democracy, where "the people rule"/ the power is IN the people....
Sources say (more complex): The Ancient Greeks gave the founders of America the initial concept of democracy. Democracy by Americas ideas (quote from Abraham Lincoln) : “a government of the people, by the people, for the people.” By the people of Ancient Greece democracy meant : “power of the people,”