As historians study history and create historical arguments their view of history shape by their......
1. Education
2. Religions affiliation
3.ideology
4. Historiography
Or beliefs that help from their opinions. They made choose sources that support their beliefs and ideals.

Some historians may write only to promote a practical cause. Such writing is considered to be ...
1.Biography
2. Propaganda
3. Hypothesis
4. Cliometrics
And it's typically
1. Positive
2. Informational
3. Biased