Mass removal and incarceration
In March 1942, the U.S. government began uprooting about 120,000 people of Japanese ancestry from their homes on the West Coast and incarcerating them in various government facilities around the nation. 
Today, these facilities are often called “internment camps,” although scholars have advocated the use of less euphemistic terms such as “concentration camps” (which was the term used popularly at the time. After forced removal, prisoners were typically first whisked to “Assembly Centers”–usually racetrack stables or hastily-built barracks at county fairgrounds to temporarily house inmates in 1942-43–while more permanent camps were constructed.
A few weeks or months later, they were eventually moved to one of the 10 permanent “Relocation Centers” run by the War Relocation Authority (WRA), where they spent the remainder of their detention.