The onshore tax havens Delaware, Wyoming, and Nevada are vastly worse in scope than any offshore country. They push the narrative about those “terrible foreign countries” to distract us from this fact.
The problem is US tax code, not offshore financial centers.
I don’t know where OP is, but here in Massachusetts, we have no sales tax on groceries:
https://www.salestaxhandbook.com/massachusetts/sales-tax-exemptions