Though at least options B,C, and D were all part of the group Lost Generation, Gertrude Stein technically coined the term.
Greek empire of Alexander the great
One branch of government can check the other through the usage of "Checks and Balances", which states that no one branch can become to powerful, as the others have the right to suppress the other branch's power.
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The correct answer is the Bill of Rights
It was the set of the first 10 amendments that were all passed at the same time and included amendments that were supposed to protect people and states from the government in case the government became corrupt. It established many important things like the right to free speech or the right to bear arms.