Polynesian, Melanesian and Micronesian peoples originally populated many of the present-day Pacific Island countries in the Oceania region over the course of thousands of years. European, American, Chilean and Japanese colonial expansion in the Pacific brought many of these areas under non-indigenous administration, mainly during the 19th century. During the 20th century, several of these former colonies gained independence and nation-states formed under local control. However, various peoples have put forward claims for indigenous recognition where their islands are still under external administration; examples include the Chamorros of Guam and the Northern Marianas, and the Marshallese of the Marshall Islands. Some islands remain under administration from Paris, Washington, London or Wellington.