I'm confused to what the question is?
Answer:
If allowed to continue, tax evasion was a serious offense.
Explanation:
Tax evasion refers to the practice where an individual refuses to pay his taxes. In "Disobedencia Civil," we can see how Thoreau reinforces the idea of committing tax evasion if the American government continues to use taxes to finance wars and unnecessary intrigues that cause the return and not the progress of the population. In this case, he refers to tax evasion as a civil disobedience, as he recognizes that for society and the government this would be a serious and offensive act.