Saylor’s spot on about citizenships, but residencies matter too! Most countries don’t tax globally like the U.S. Digital nomads can often go zero income-tax, and the setup costs pay off in a year with tax savings, plus you skip accounting headaches.
You can find more details about the setup here: 
Paraguay: Tax Heaven for Freelancers | Hacking Lives
Tax residency in Paraguay: 0% tax on international income, no minimum stay, easy to maintain. Perfect for digital nomads to optimize their taxes.