If we consider a country to be a self-governing political entity with a defined territory and population, then the first country could be considered to be the Kingdom of Sumer in Mesopotamia, which emerged in the 4th millennium BC. Sumer was a collection of city-states located in southern Iraq, and is widely regarded as the birthplace of civilization.
Alternatively, if we consider a country to be a region with a distinct cultural or ethnic identity, then the first country could be considered to be Egypt, which has a long and well-documented history dating back to the 32nd century BC. Egypt was home to one of the most advanced ancient civilizations, and its rich cultural heritage and political structures set the stage for the development of many other civilizations.
Ultimately, the question of which country is the first country is a matter of debate, and there are different perspectives depending on the criteria used.