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.
Joint Base LewisâMcChord is a training and mobilization center for all services and is the only Army power projection base west of the Rocky Mountains.n 2009, the former Fort Lewis Regional Correction Facility was remodeled and renamed the Northwest Joint Regional Correctional Facility (NWJRCF). The facility houses minimum and medium security prisoners from all branches of the U.S. Armed Forces.