Final answer:
Athens was the Greek city-state governed by a direct democracy in its early days.
Step-by-step explanation:
The Greek city-state that was governed by a direct democracy in its infancy was Athens. In Athens, all citizens had the right to participate directly in the decision-making process, as they gathered in the Assembly to vote on laws and policies. This form of government allowed for a greater level of political participation and representation compared to other city-states like Sparta, Argos, and Corinth.
Learn more about Greek city-state governance