The eastern island-group became a territory of the United States (the Tutuila Islands in 1900 and officially Manu'a in 1904) and was known as American Samoa. The western islands, by far the greater landmass, became German Samoa. The United Kingdom had vacated all claims in Samoa and in return received (1) termination of German rights in Tonga, (2) all of the Solomon Islands south of Bougainville, and (3) territorial alignments in West Africa.