Advantages: changed the way humans lived, allowed humans to form permanent settlements via agriculture, formed social classes, advances in technology
disadvantages: people had poorer nutrition and lower life expectancies, lifestyles were more labor intensive
Because so they can avoid opinions and get the facts. Also because depending on the origin of the historian, he may have a prerequisite <span>feelings towards a culture or a nation.</span>
President Truman was a very no-nonsense man. His famous quote "The buck stops here" showed that. hope that helps and good luck