Here's why:
* Pre-cuneiform systems: Evidence suggests that other civilizations, like the Egyptians and the Indus Valley people, may have developed their own forms of writing around the same time, or even earlier, than the Mesopotamians.
* Pictographic origins: Most early writing systems, including cuneiform, developed from pictographs, which are simple drawings representing objects or ideas. It's likely that these pictographic systems were used by multiple cultures independently.
Therefore, attributing the "first" form of writing to the Mesopotamians is an oversimplification. They were, however, pioneers in developing a complex and sophisticated writing system known as cuneiform, which used wedge-shaped marks pressed into clay tablets. This system was used for thousands of years and played a vital role in the development of their civilization.
So, while not the absolute first, the Mesopotamians made a significant contribution to the history of writing and laid the foundation for many later writing systems.