C. Legislative branch
The Articles of Confederation created a national government composed of a Congress, which had the power to declare war, appoint military officers, sign treaties, make alliances, appoint foreign ambassadors, and manage relations with Indians.
This was an early example of "<span>B. separation of powers" since this was done in order to ensure that no single branch of government became too powerful and therefore tyrannical. </span>
They realized that nothing really changed much. The freed African-Americans still had almost no political rights and the system was controlled mostly by corrupt politicians who came from the north to become rich. The regular people still had huge farms and turned the former slave system into a system of sharecropping which was in many ways similar to slavery. The freedom was very superficial and in reality people still lived as bad as before the war.
Nobles had overthrown most of the monarchs by 750 B.C.