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.
Lewis County in southwest Washington can truly be called the âmother of counties.â Half of the present-day Washington and of British Columbia were carved from its original borders. But the countyâs location astride the Cowlitz Trail between the Columbia River and Puget Sound meant that communities with good water access would develop first.