It is false in more ways than one. The fortifications were not constructed from wads of dollar bills, or armed with cannon made from rolls of currency. The tax dollars in question were spent to purchase masonry, and armor plate, and iron guns. And much of the money was spent in Northern States, even though equivalent materials were available from Southern sources. Bricks for the construction of at least one Southern fort, for example, were shipped all the way from New England (probably using Yankee ships). If authorized today, the construction program might be called 'pork barrel spending,' or 'corporate welfare' for Northern industries. In essence, the Northern States were paid for the fortifications before the Southern States ever seceded...
;>)
Indeed. IIRC they even shipped the stone to create Fort Sumter island with from up north. And I'm sure those poor yankee quarry owners lodged protest about that when the feds came to buy their rocks!