[Revolutionary]

The first part is the why and the second part is the what. That is why the focus by the Supremes on the second part.

Also: regulated, properly translated, means armed. And as another poster quipped, militia is 18-45 year old males, but in this case I think it translates to populace.

[Forty-Niner]

Sorry but “well regulated” is more properly read as “proficient” or well trained”....When I see the word “regulated” in older texts I always think of the “regulator” clocks of old that kept accurate time.