What were the most defining moments of the 20th century for Canada?

So the essay should be 4-5 pages long. Each body paragraph should include 3 points, proofs and explanation. AT the end of each proofs in the body paragraphs there should be a intext citation in MLA format. THe work cited page should also be in MLA format. There should e atleast 5 sources in the work cited page, At least one of them should be a book. So I have written the thesis Statement which is: The defining moments in Canada’s History is focused in the advancements and improvements to society. This is seen in the moments of persons case, discovery of oil in alberta and discovery of insulin. SO basically I have written the thesis statement just try to make it better but the defining moments should definitely be the following: persons case, discovery of oil in alberta and discovery of insulin