The same Fort Sumter that was reinforced by the Union to facilitate tax collection in South Carolina? That Fort Sumter?
Now if you are talking about the federal income tax, another poster noted that it was pasted into the Constitution to assuage the sensibility of Southerners who were getting darned tired of direct taxation on imports ~ inasmuch as they imported almost everything they used (except cotton).
If taxes were the issue, you boys sure got even with everybody. Now go pray to God that he might forgive you someday!