Homo Habilis were the first hominids to control fire. Homo Habilis used fire to cook their food, warm their caves, and light. After Homo Habilis, fire passed on through generations of hominids.
Hominids used caves and roughly built tents made of sticks and animal skins as shelter. They would not stay in one place for long for they had to track down the herds of animals for food.
Hominids used bows or spears to hunt animals for food. Hunting usually took all day to provide food for a group to survive. The spears were a long stick with a sharpened piece of flint on the end. The bow shot arrows so hunting could be done from a distance.
People discovered seeds produced vegetation that could then be eaten when harvested. Not only did they discover crops, but they also found out they could domesticate animals for meat. Once farming was mastered, villages had a stable food supply and had time to do other crafts such as making tunics or pottery.
After farming was mastered, Sumerians had time to trade their crafts or goods. They traded flint, obsidian, pots, baskets, shell ornaments, hematite, mirrors, knowledge...
Sumerians didn't have cities, but they did have villages as towns. They had houses to live in with no front doors but they did have hatches on the roofs.
There are still some villages in the world, but there aren't very much. Villages have upgraded to town and then to cities. Villages have helped our economy.
The plow is a great Sumerian invention that over turns the Earth. The plow helps with planting crops and makes it quicker and easier. The first plow was made of wood and soon the blade was turned into a metal one.
Irragation systems were dug or made to help get the water to the crops. Sumerians built and dug levees, canals, and reservoirs. But silt would get into the canals and reservoirs so villages would work together to get iT out.
Without the Sumerians coming up city-states some of the great big cities in the world couldn't be made. For Sumerians, city-states were a safe shelter to live in.