3,500 BC
Carts with wheels
The ancient Sumerians were among the first to use wagons to carry goods and people. Solid wooden wheels were attached to carts, creating vehicles for transporting people, hauling goods and war weapons.
The ancient Sumerians were among the first to use wagons to carry goods and people. Solid wooden wheels were attached to carts, creating vehicles for transporting people, hauling goods and war weapons.
Formation of number system
The ancient Sumerians invented the number system to count, measure land and to keep records of costs and prices.
The ancient Sumerians invented the number system to count, measure land and to keep records of costs and prices.
Era of River Valley Civilizations (3500 BC to 1500 BC)
The first civilizations all appeared in the valleys of rivers: Egypt along the Nile, the Mesopotamian city states along the Tigris and Euphrates, early India along the Indus River and early China along the Yellow River. This is because these ancient communities needed a reliable water supply, whether for the annual flooding of crops or for crop irrigation.
The first civilizations all appeared in the valleys of rivers: Egypt along the Nile, the Mesopotamian city states along the Tigris and Euphrates, early India along the Indus River and early China along the Yellow River. This is because these ancient communities needed a reliable water supply, whether for the annual flooding of crops or for crop irrigation.
