Answer:
The historical data is different from scientific data because there is no option to replicated historical data in real life while a scientific data can be replicated and reconstructed any time in the future.
The distortion of historical data can occur by losing the historical data, hiding the historical data, or by destroying the historical data.
Distortion can also occur by teaching manipulated stories by leaders to impose a particular ideology. For example, some history containing myths and exaggerated heroism are taught in schools.