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.
LOCATION: Lewis County, located in southwest Washington state, covers 2,449 square miles(96Ã26 miles) from the summit of the Cascade Range in the east to the Chehalis River valley in the west.istory and Historical Sites in Lewis County. From rolling hills and valleys in the west to mountainous regions in the east, Lewis County, named after the explorer, Meriwether Lewis, suggests a feeling of times past. Even the cities of Centralia and Chehalis maintain their historic, small-town charm.