Check out this 1911 ruling on West Virginia and Virginia. It does not mention Virginia's ordinance of secession as being illegal or null and void. This makes West Virginia pay it debts to Virginia for a period from 1820 to 1861.

http://caselaw.lp.findlaw.com/scripts/getcase.pl?navby=search&court=US&case=/us/220/1.html

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David Upton