What is the author’s main argument? It must be more than “Columbus was/was not a

What is the author’s main argument?
It must be more than “Columbus was/was not an imperialist.” How does the author support their claim?
You must identify both the claim and the line of reasoning for their claim.
Hint: The claim for YES is Columbus was an imperialist. The claim for NO is Columbus was not an imperialist.
This must be written in complete sentences.
Next, identify the evidence that the author uses to support their argument.
This evidence would be the sources utilized, direct quotes, specific evidence/rationale, etc.
This may be bullet-pointed.
Evaluate whether the author is effective in presenting his/her argument. You must come to a decision as a group.
This must evaluation must be at least a paragraph in length. (Written in the third person and in complete sentences.)
Use evidence to explain why, as a group, you believe the author is or is not effective in presenting his or her argument.
I need only the part saying columbus wasnt imeralist(written by Robert royal, the first part of the document saying he was I don’t need