What are the reasons that prevent us from obtaining accurate and reliable information about the past?

Information about the past is preserved in the form of various manuscripts, monuments, state documents issued by the rulers. During the entire time, there were many wars that destroyed some of the monuments and buildings. Some documents were also lost. However, many survived. From them, you can recover some of the information about the events that took place over many centuries in our country, as well as in other countries of the world.