Yes, fear. During World War II, the United States main land have not been compromised. However, the attack on Peal Harbor, Americans became worried, and the Japanese army invaded many other countries. Americans began to worry about the Japanese in the United states. They worried about those Japanese people invaded the U.S. And they think these people had spies and terrorists. They were worried about their safety. That was why the president Roosevelt signed that order. Also, one thing we need to know, “3,200 about 11,000 German residents - including some naturalized citizens- were arrested and more than 5000 were interned. Yet while these individuals suffered grievous violations of their civil liberties, the war- time measures applied to Japanese Americans were worse and more sweeping, uprooting entire communities and targeting citizens as well as resident aliens.”( by executive order 9066 : The president Authorizes Japanese Relocation). With this thing, we saw, during World War II, not only those Japanese have been arrested. But also German and Italy people have been