During Roxas' term of office administration of the Turtle Islands and Mangsee Islands was transferred by the United Kingdom to the Republic of the Philippines. By an international treaty concluded in 1930 between the United States (in respect of its then overseas territory, the Philippine Archipelago) and the United Kingdom (in respect of its then protectorate, the State of North Borneo) the two powers agreed the international boundaries between those respective territories. In that treaty the United Kingdom also accepted that the Turtle Islands as well as the Mangsee Islands were part of the Philippines Archipelago and therefore under US sovereignty. However, by a supplemental international treaty concluded at the same time, the two powers agreed that those islands, although part of the Philippines Archipelago, would remain under the administration of the State of North Borneo's British North Borneo Company. The supplemental treaty provided that the British North Borneo Company would continue to administer those islands unless and until the United States government gave notice to the United Kingdom calling for administration of the islands to be transferred to the U.S. The U.S. never gave such a notice. On the 4th of July, 1946, the Republic of the Philippines was born. It became the successor to the U.S. under the treaties of 1930. On July 15, 1946, the United Kingdom annexed the State of North Borneo and, in the view of the United Kingdom, became the sovereign power with respect to what had been the State of North Borneo. On September 19, 1946, the Republic of the Philippines notified the United Kingdom that it wished to take over the administration of the Turtle Islands, Tawi Tawi and the Mangesse Islands. Pursuant to a supplemental international agreement, the transfer of administration became effective on October 16, 1947.