Respuesta :
This course can be characterized as credible, factual, and secondary.
- It is credible because it is written by an academic, a history expert who is associated with a prestigious university.
- It is factual because the author is examining actual events which took place in history ("the impact of railroads on the growth of the United States").
- It is a secondary source because it is the work of someone writing about past events retrospectively, as opposed to primary sources which are first-hand documents (like letters, pieces of legislation, speeches, etc.).
Answer:
i would say it is credible, factual, and secondary!
Explanation: