I live in a fantasy world (not just in sports...) and would like to believe there is a way to create a situation where HS students will wonder and ask questions that will lead to learning about WWII.
My two cents:
Create a novel problem. Present them with a situation (or set of situations, small groups, individual assignments, pick a question to answer, whatever suits your style), BUT, to be novel, remove the names of countries, people, and the time/year. Give them a circumstance, and ask them to solve the problem.
Perhaps, with some great facilitation on your part and a dose of luck, they may "reinvent the wheel" and give an idea that actually happened. Ex: give them the social, economic, and political conditions that Germany faced, wrecked economy etc., and see what they try to do. Will someone suggest a need for national pride, like a sports team or winning the Olympics or something (1936), or some other forms of creating nationalistic pride (military strength), or look to unite behind a common (real or perceived) oppressor?
Some context will be needed eventually, as annexing territory seems really crazy now, but colonialism and expansionism were both standard happenings until WWII, and certainly within the lifetime of those in power at the time. The whole thing ends up being an explication of different ways of solving the problems presented at first.
Good luck. I'd never want to teach HS. I prefer the latitude of postsecondary ed...