In addition to granting the government powers to regulate trade and raise revenue that it either lacked or could not enforce under the Articles of Confederation, the Framers intended the Constitution to centralize much, if not all, power over foreign affairs. Many of the federal government's enumerated powers relate to foreign affairs and have corresponding restrictions on states in Article I, Section 10. Article VI of the Articles of Confederation had permitted the states to conclude treaties with foreign governments with the consent of Congress. States could also grant letters of marque and reprisal after Congress had declared war. While some of Article I, Section 10's proscriptions, like the ability to levy tonnage duties or enter into "compacts or agreements," may be permitted by Congress, others, like the prohibitions described here, are absolute.