What is a good conclusion for comparing and contrasting WWI and WWII?

What is a good conclusion for comparing and contrasting WWI and WWII?
i am doing an essay for world history and i need a conclusion for the end by tieing up everything by comparing and contrasting. i need a very stong conclusion. if you can give me and help at all that would be great!
btw: it begins like this- “In conclusion, both world wars…”
please help….asap!

Recognizing comparison/contrast in assignments
Some assignments use words — like compare, contrast, similarities, and differences — that make it easy
for you to see that they are asking you to compare and/or contrast. Here are a few hypothetical
𐁺 Compare and contrast Frye’s and Bartky’s accounts of oppression.
𐁺 Compare WWI to WWII, identifying similarities in the causes, development, and outcomes of the
𐁺 Contrast Wordsworth and Coleridge; what are the major differences in their poetry?
Notice that some topics ask only for comparison, others only for contrast, and others for both.
But it’s not always so easy to tell whether an assignment is asking you to include comparison/contrast.
And in some cases, comparison/contrast is only part of the essay — you begin by comparing and/or
contrasting two or more things and then use what you’ve learned to construct an argument or evaluation.
Consider these examples, noticing the language that is used to ask for the comparison/contrast and
whether the comparison/contrast is only one part of a larger assignment:
Two historical periods or events
When did they occur — do you know the date(s) and duration? What happened or changed
during each? Why are they significant? What kinds of work did people do? What kinds of
relationships did they have? What did they value? What kinds of governments were there?
Who were important people involved? What caused events in these periods, and what
consequences did they have later on?
Two ideas or theories
What are they about? Did they originate at some particular time? Who created them? Who
uses or defends them? What is the central focus, claim, or goal of each? What conclusions
do they offer? How are they applied to situations/people/things/etc.? Which seems more
plausible to you, and why? How broad is their scope? What kind of evidence is usually
offered for them?