Fantasy.
The Militia Act --assumes-- that the state government has been perverted or overthrown. It was passed at the request of George Washington.
It was one of the grounds cited by the Supreme Court in 1862 for the propriety of President Lincoln's actions. President Lincoln was required by his oath to resist the overthrow of the lawful government.
I don't care what you heard as a toddler.
Walt
The states that seceded did so using the same republican principles upon which our entire system of government is based. You might have a point if a small faction of rebels had actually overthrown their state's government. The truth is that a majority of the duly elected representatives of the people in the state legislature voted to secede.