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.ort Lewis proper contains 86,000 acres (35,000 ha); the Yakima Training Center covers 324,000 acres (131,000 ha). JBLM Main & North have abundant high-quality, close-in training areas, including 115 live fire ranges.