Why is World War 2 a continuation of World War 1?

I need a five paragraph essay on why WW1 led to WW2?

The essay must include an introductory paragraph with thesis, 3 body paragraphs each with a reason as to why it was a continuation (Treaty of Versailles can be one), and a concluding paragraph. I need supporting details from both WW1 and WW2 that build a logical argument. Please use formal language and no third person statements.