Should the Tax Regime be created for a responsibility OR for a country

Hi,

Should the Tax Regime be created for a responsibility OR for a country?

Ex: If I have multiple responsibilities in Receivables within USA , Payables within USA; should I create Tax Regime for each responsibility or based on the country USA and share the regime across different Tax Responsibilities?

The Tax rates will be loaded from third party rate provider, ex: TaxWare, Vertex etc.

Thanks,

Nishank