Historians think like historians
Historians examine the causes and the consequences of events. This is more precise than just the context; these are the reasons why something happened, and the things that happened afterwards because of it.
Historians also try to determine what has changed and what has stayed the same, and again, they try to explain why.
And like you, they state their opinion. You can do the same in your essay, and you can state why your opinion differs or is the same as other writers.
When you are writing a history essay, try to remember these strategies. Another good source for strategies is The Historial Thinking Project at http://historicalthinking.ca/
The above image (s) were taken from the McCord online exhibit entitled Urban Life through Two Lenses, specifically from the photographic pairing entitled “View of the Montreal Habour” (Public Domain)