The united states national government can be classified as

The answer is a republic, because we elect representatives to vote on bills for us. If it were a democracy we would vote on everything including bills. "To the republic" - pledge of Allegiance

It is c. naturally in the environment

Historians are researchers of the past or people who understand the history of people. with this field, they must possess qualities such as being unbiased, patient, efficient reader, has a knack for logic and critical thinking and reasoning, disciplined, open-minded, resourceful, with good analytical ability, good reasoning skills and problem solving!