The Old Kingdom in Egypt lasted from around 2650-2134 BCE and saw the rise of pyramid building under pharaohs like Djoser. The First Intermediate Period then began around 2181 BCE as the centralized power declined, leading to conflict between Upper and Lower Egypt. Global cooling caused famine and civil unrest. The economy relied heavily on agriculture along the Nile. Religion centered around gods like Ptah in Memphis and Re in Heliopolis, though their roles were debated. Trade occurred with places like Nubia, Canaan, and Byblos.