“BUT, most States have some sort of official militia.”
These “militias” are formerly known as state guards. Twenty-six states have state guards. They are not associated with a state national guard. State guards are controlled by the state’s governor and cannot be drafted into duty by the federal government.
Many of those are inactive; without a war going on, the federal government fears we’ll have a replay of 1861, when half the states’ militias fought the other half for four years...