Reconstructed history is built using evidence when written records are missing. Historians and archaeologists use clues to understand what happened in the past. This method is often used for very early time periods.

Evidence such as fossils, tools, cave art, and burial sites helps create a picture of past life. For example, early human migration is studied using bones and stone tools found in Africa and Asia. Oral traditions can also provide important information.

Reconstructed history can change when new discoveries are made. As more evidence is found, historians update their understanding of past events.