Which was a power of the Confederation Congress (1781 and ndash1789) but not a power of the state governments?

The Confederation Congress had the power to conduct foreign diplomacy and manage relations with other nations, which was not a power granted to individual state governments. It could negotiate treaties and alliances, representing the unified interests of the states on the international stage. In contrast, state governments were limited in their ability to engage independently in foreign affairs, as this could undermine the unity of the nation.