What are they looking for in this application question?

I am applying to go on a high school student exchange with rotary club, and I’m currently filling out the first form. One of the questions is “Describe the American form of government”. Does anyone have any idea of what they’re looking for as a response? a straightforward answer, as I might give in a history test? Or are they looking for more of an opinion on how America is governed? Or something else I haven’t even considered yet? please help!