Final answer:
The concentration of political power in large chiefdoms is a key attribute of the Early State that is unique to states and not found in egalitarian and ranked societies.
Step-by-step explanation:
One key attribute of the Early State is the concentration of political power in large chiefdoms, which gradually leads to the emergence of states. This concentration of power is driven by population growth, increasing social stratification, militaristic threats from neighboring societies, and regional trade opportunities. These forces, known as integrative pressures and conflict pressures, propel the process of state formation. This attribute is unique to states and not found in egalitarian and ranked societies.