One of Salim's final diplomatic service was as part of the Indonesian delegation in the Dutch–Indonesian Round Table Conference in The Hague on late 1949. Hatta's second cabinet was dissolved in December 1949 and the United States of Indonesia was formed. Hatta, the United States' inaugural (and only) premier and foreign minister, appointed Salim to be a special advisor on foreign affairs. The United States itself was dissolved in September 1950.