What does external migration mean? The definition of external migration is migrating, or moving, to a new home in a different state, country, or continent. This is a form of human migration. Birds migrate a â¦ t specific times of the year and travel to other states or countries as the seasons change.
Fort Lewis was originally established in 1917 with the passage of a Pierce County bond measure to purchase 70,000 acres (280 km2) of land to donate to the federal government for permanent use as a military installation. A portion of the initial land was taken from the Nisqually tribe's reservation.
The census-designated place (CDP) Fort Lewis is located within the installation's area. As of the 2000 census, the CDP, which includes the most densely populated part of the base, had a total population of 19,089.ray Army Airfield (IATA: GRF, ICAO: KGRF), is a military airport located within Fort Lewis. The field is named in honor of Captain Lawrence C. Gray, who lost his life during a free balloon flight at the field on 4 November 1927. It is used by Army helicopters.