Which of the following describes an important contribution of the Greek thinkers Socrates?

What is the purpose of the system of checks and balances

Revolutionary war. date battle result april 19, 1775 june 17, 1775 dec. 31, 1775 aug. 27, 1776 oct. 26, 1776 dec. 26, 1776 sept. 11, 1777 sept. 19, 1777 oct. 4, 1777 oct. 7, 1777 dec. 5, 1777 june 8, 1778 sept. 16, 1779 march 29, 1780 sept. 28, 1781 can i get the name of the battles and the result on the battles on the dates above

The information box says that the han added 4,000 miles of wall.refer to the mileage scale.how can this be true?