In the United States, about 92,000 people of Japanese ancestry were uprooted under Executive Order 9066. They were initially sent to “Assembly Centers” – makeshift concentration camps providing temporary housing. Altogether fifteen of these emergency camps were set up by the United States army pending the construction of more permanent inland concentration camps. Japanese Americans spent an average of three months there before being transferred to a permanent concentration camp. According to the army, Assembly Centers were required because of the need for immediate incarceration of Japanese Americans living on the West Coast.
For a complete list of these Assembly Centers, and more information about the situation in the United States, click encyclopedia.densho.org/Assembly_centers