In 1846, the first black governor of Liberia, Joseph Jenkins Roberts, requested the Liberian legislature to declare independence, but in a manner that would allow them to maintain contacts with the ACS. The legislature called for a referendum, in which Liberians chose independence. On July 26, 1847, a group of eleven signatories declared Liberia an independent nation. The ACS as well as several northern state governments and local colonization chapters continued to provide money and emigrants as late as the 1870s. The United States government declined to act upon requests from the ACS to make Liberia an American colony or to establish a formal protectorate over Liberia, but it did exercise a "moral protectorate" over Liberia, intervening when threats manifested towards Liberian territorial expansion or sovereignty. Upon Liberian independence, Roberts was elected as the first president of Liberia.