Between 1900 and 1930, the city's population tripled from nearly 100,000 to 301,815. During World War II, it housed an "assembly center" from which up to 3,676 people of Japanese descent were dispatched to internment camps in the heartland. It was the first American city to have residents report thus, and the Pacific International Livestock Exposition operated from May through September 10, 1942 processing people from the city, northern Oregon, and central Washington. General John DeWitt called the city the first "Jap-free city on the West Coast."