[Who is John Galt?]

The point is, they had accepted 'foreign troops' on their soil while they were still part of the United States.

Only if you assume that a plebiscite was somehow required to authorize secession.

Care to cite some references? (BTW, it will be extremely entertaining to see you trying to justify 'the right of State secession via plebiscite'... ;>)

[Non-Sequitur]

Care to cite some references?

Virginia's secession declaration. It clearly states it's contingent on a vote by the citizens of the commonwealth. Such a vote didn't take place until after they were admitted as a confederate state, after they had taken hostile actions against the federal government, and after they had allowed confederate troops on their soil.