Which region of the US attracted migrants to its defense in the trees in military bases?

The Pacific Northwest region of the United States attracted migrants to its defense industries, particularly during World War II. The establishment of military bases and defense-related jobs in cities like Seattle and Portland drew many workers seeking employment. This influx was further supported by the area's dense forests, which provided timber for military supplies and construction. As a result, the region experienced significant population growth and economic development during this period.