Why did the most ancient and ancient people settled around the world?

Ancient people lived in poor conditions. They were forced to constantly look for food for themselves. They were looking for the best places to stay. Thus, they were in constant motion. The migration has continued for tens of thousands of years. Ultimately, people in half a million years were able to populate the entire earth. Despite this, the migration continued further. For example, in Asia, in the steppe zones, tribes constantly wandered from place to place, as they got used to this way of life and adjusted their economy to it.