Did ancient Mesopotamia and ancient Egypt share a common culture, or did each civilization have its own unique culture?

Mesopotamia and Egypt had mostly the same beliefs. They believed in Polytheism which is the belief in many gods, besides one. They both counted on the gods for a good harvesting season, and if either one got drought, or hunger, they believed that was the gods way of punishing them for their actions, or that they were angry at the people

Explanation:

The Lewis and Clark expedition, also known as the Corps of Discovery, started its lengthy journey to explore the lands of the Louisiana Purchase in search of a river route across the West to the Pacific Ocean in May 1804. They travelled up the Missouri River all the way to the village of St. Charles. The men received no more supplies or reinforcements after they passed that village. During the summer of 1804, after travelling for more than 600 miles, the Corps of Discovery finally met some Native Americans who helped them and provided them with fresh fruits and vegetables. They also provided them with horses and a guide to lead them across the Rocky Mountains.