Japanese internment camps were formed because of the bombing of Pearl Harbor. The U.S. thought that they might be spies, so they put all of the Japanese, most of which were citizens, into internment camps.
Jewish concentration camps were formed because of Hitler. Hitler thought that Jewish people were different and he wanted them all gone. So he put them all into concentration camps where he later tortured and murdered them.
Two months after the Japanese bombing of Pearl Harbor(February 19, 1942), U.S. President Franklin D. Roosevelt signed Executive Order 9066 ordering all Japanese Americans to evacuate the West Coast. This resulted in the relocation of approximately 120,000 people, many of whom were American citizens, to one of the 10 internment camps located across the country.
Between 1933 and 1945, Germany established about 20,000 camps to imprison millions of victims. These camps were used for a range of purposes including forced-labor camps, transit camps which served as temporary way stations, and killing centers built primarily or exclusively for mass murder.