In the article of ancient Greece, we introduce the golden age of 500-350 BC. It tells what the Greeks did, the people they worship, and other important things. The Greeks are best known for their gods and stories about them. The story explains the change of things. For example, there is a controversy between God and the giant before the Earth was built. God killed the giant, and a part of the giant turned to the earth. His teeth turned into rocks and his hair became grass.
First, since "ancient Greece" is geographical rather than entity, it is not possible to compare "ancient Greece" and "ancient Rome". What I call "ancient Greece" is the land itself of Greek we know now, but that was a long time ago. This is because Greek city states living in this land collapse and are constantly fighting each other. They have no unit at all! Occasionally, like the Delhi alliance and the Corinthian alliance, we build loosely integrated alliances, they follow the same interests and offer military and economic aid to each other. In most cases, the alliance is led by superpowers that are forcing other countries to participate in the threat sabotage. So it is not completely unified. For comparison, it is necessary to show completely different city conditions.
When asking where you came from ancient Greece, Greece was not the country at that time, so they will not say that they came from Greece. It is not Greece. However, there are Athens, Sparta, Corinth, Megara, and hundreds of Greek city states, each with its own personality and way. So they would say they came from Athens, Sparta, Corinth, or Argos. The Greeks are very proud of their city state.
Ancient Greece revealed the concept of democracy and thought in the fields of science and art. Ancient Greece was not a country, on the contrary, an independent city state existed; these nations had their own government and military. Sparta and Athens are the most powerful countries in ancient Greece; they are also the biggest competitors of each other. The land around the city state was barren, so both of them had problems for their people. As a result, they began to conquer the country with adequate food supply, and in return, the conquered land would be protected by the invading army.