The Maryland Campaign was Lee's first attempt. It was the most fatal day in American history.
The second was the Gettysburg Campaign, which crashed and burned.
The correct answer to this open question is the following.
Complex Society.-
Development of metal armor, creation of laws and rules, and creation of a bureaucracy.
Agrarian Society.-
Domestication of animals, planting of seeds, and development of grain distribution
The Sumerians, the oldest civilization on planet earth, developed agriculture techniques that allowed them to settled in and farm the fields to produce crops. They settled in the middle of the Tigris and Euphrates Rivers and knew how to benefit from the flooding of the rivers and the fertile soil. They started as an agrarian society. But as they grew as a society and established important city-states such as Lagash, Eridu, Ur, Nippur or Uruk, Sumerians and other ancient civilizations such as Ancient Egypt and the Indus Valley civilization, created laws and rules, and a bureaucracy, as part of their governments.
Around 1885 or 1886 the term "No Man's Land" became widely applied to the Public Land Strip. True to the plain language of the old West, the nickname referred simply to the fact that no man could legally own land in the Strip.
another answer is:
No man's land is land that is unoccupied or is under dispute between parties who leave it unoccupied out of fear or uncertainty. The term was originally used to define a contested territory or a dumping ground for refuse between fiefdoms.