Which period of Egyptian history saw the countries unification the use of copper weapons and tools and the design of sophisticated irrigation techniques?

The period of Egyptian history that saw the country's unification, the use of copper weapons and tools, and the development of sophisticated irrigation techniques is known as the Early Dynastic Period, specifically around 3100 to 2686 BCE. This era began with the unification of Upper and Lower Egypt under the first pharaoh, Narmer (also known as Menes). Innovations in agriculture and Metallurgy during this time laid the foundation for the advancement of Egyptian civilization.